The Cities of Atlanta and College Park entered into an agreement in 1969 (the “Agreement”) for purposes of expanding Atlanta Hartsfield-Jackson International Airport (the “Airport”). One of the provisions of the Agreement granted Atlanta the exclusive right to collect and levy occupation taxes from businesses located at its Airport that were within the city limits of College Park. In 2007, after commissioning a study for the purpose of reassessing this relationship, College Park informed Atlanta and Airport businesses that it would no longer honor the 1969 Agreement and that it would now seek to collect occupation taxes from the Airport businesses including Atlanta’s proprietary business operations.
Atlanta filed a declaratory action in Fulton County Superior Court seeking a judgment that the 1969 Agreement controlled the collection of occupation taxes from businesses operating at the Airport within College Park. Both Atlanta and College Park moved for partial summary judgment, and, in ruling on the cross-motions, the trial court found that Atlanta and College Park’s 1969 Agreement was unenforceable. The trial court further ruled that OCGA § 48-13-13 (5), which prohibits local governments from levying an occupation tax on any “local authority,” precluded College Park from levying an occupation tax on Atlanta’s proprietary operations because Atlanta met the definition of a “local authority” under the statute.1
Both parties appealed, and the Court of Appeals affirmed the trial court’s judgment invalidating the 1969Agreement, but reversed the trial court’s finding that the term “local authority” as used in OCGA § 48-13-13 (5) included municipalities. Accordingly, because Atlanta was not a “local authority” that was exempt from the imposition of occupation taxes, the Court of Appeals found that College Park could properly levy an occupation tax on the City of Atlanta for its proprietary operations occurring within College Park. City of Atlanta v. City of College Park, 311 Ga. App. 62 (2) (715 SE2d 158) (2011). This Court granted Atlanta’s petition for certiorari to determine whether the Court of Appeals erred when it determined that the City of Atlanta was not a “local authority” as that term is used in OCGA § 48-13-13 (5). For the reasons that follow, we affirm.
*742With respect to its power to collect a tax, “the governing authority of any... municipality... may exercise [such] power... as authorized by th[e Georgia] Constitution or by general law.” Ga. Const. Art. IX, Sec. IV, Par. I (a). And, with respect to its responsibility to pay a tax, a municipality is not necessarily exempted from paying taxes whenever it conducts activities outside of its own territorial limits that would otherwise subject it to paying a tax. See, e.g., OCGA § 48-5-41 (a) (1) (B) (Subject to certain statutorily created exceptions, “[n]o public real property which is owned by a political subdivision of this state and which is situated outside the territorial limits of the political subdivision shall be exempt from ad valorem taxation”). See also, e.g., Clayton County Bd. of Tax Assessors v. City of Atlanta, 286 Ga. App. 193, 203 (4) (648 SE2d 701) (2007) (City of Atlanta was not exempt from paying ad valorem taxes to Clayton County where Atlanta had only acted in “its proprietary capacity” with respect to a “profit-generating undertaking” in the County), overruled on other grounds by Gilmer County Bd. of Tax Assessors v. Spence, 309 Ga. App. 482 (1) (a) (711 SE2d 51) (2011).
Pursuant to the Georgia Public Revenue Code (OCGA § 48-1-1 et seq.), “each municipal corporation is authorized ... to provide ... for the levy, assessment, and collection of occupation tax on those businesses and practitioners of professions and occupations which have one or more locations or offices within the corporate limits.” OCGA § 48-13-6 (b); OCGA § 48-13-5 (4) (An “occupation tax” is “a tax levied on persons, partnerships, corporations, or other entities for engaging in an occupation, profession, or business.”) (Emphasis supplied). Accordingly, at first glance it would appear that where a municipality such as Atlanta is not acting to carry out a government function, but rather, is acting in a proprietary business capacity outside of its own territorial limits and within the municipal corporate limits of another municipality, it could be responsible for paying occupation taxes to that municipality for conducting such proprietary business operations. Indeed, as the Court of Appeals correctly observed:
Under Georgia law, when Atlanta acts in its capacity as a lessor at the airport for the purpose of obtaining revenue, it is acting in a proprietary capacity and not carrying out a governmental function. See Clayton County Bd. of Tax Assessors[, supra]; Caroway v. City of Atlanta, 85 Ga. App. 792, 795-798 (1) (70 SE2d 126) (1952) (The City of Atlanta, which leased out portions of its municipal airport passenger terminal building for the purpose of obtaining revenue, was engaged in a proprietary function and, therefore, was subject to liability as a premises owner.); see also OCGA § 48-5-4 *743(Except as prohibited by federal law, “all property owned or possessed in this state by a corporation organized under the laws of the United States or owned or possessed by an agency of the United States engaged in this state in proprietary, as distinguished from governmental, activities shall be subject to ad valorem taxation in this state at the same rate and in the same manner as the property of private corporations owning property in this state and engaged in similar businesses.”).
City of Atlanta, supra, 311 Ga. App. at 68 (2), n. 15. The Public Revenue Code makes clear, however, that “[ljocal governments [such as the government of College Park] are not authorized to... [l]evy any occupation tax... on[, among other entities,] any... local authority.” OCGA § 48-13-13 (5). See also OCGA §§ 48-13-16 (a); 43-12-1. The City of Atlanta argues that it qualifies as a ‘local authority” under OCGA § 48-13-13 (5) such that it would not have to pay occupation taxes to the City of College Park for conducting proprietary operations there.
“Municipalities” that engage in revenue generating business within the corporate limits of another municipality are not specifically listed as entities that would be exempt from paying occupation taxes. See generally OCGA § 48-13-13. Nor is the term “local authority” defined in OCGA § 48-13-13 to include municipalities. It also is not made clear from the statute that a “local government’Vmunicipality that levies an occupation tax is the same thing as a “local authority” that is exempt from paying an occupation tax. In fact, the term “local authority’ is not defined at all in the statute. Accordingly, in order for the City of Atlanta to be exempt from paying occupation taxes for conducting revenue generating business within the city limits of College Park, it would have to be the case that the Legislature specifically intended for municipalities to be exempt “local authorities” under OCGA § 48-13-13 (5) despite failing to list municipalities as exempt entities and failing to define the term “local authority’ to specifically include municipalities.
In this regard, it can be said that, if the Legislature intended to exempt municipalities from paying occupation taxes as “local authorities” under OCGA § 48-13-13 (5), it could have expressly stated so in the statute. Morton v. Bell, 264 Ga. 832, 833 (452 SE2d 103) (1995) (“[I]f some things (of many) are expressly mentioned [in a statute], the inference is stronger that those omitted are intended to be excluded than if none at all had been mentioned”) (citations and punctuation omitted). However, this does not end our inquiry. In order to determine whether the Legislature truly intended for the *744term “local authority” to include municipalities, we must turn to the basic rules of statutory construction to determine what the Legislature intended for the term “local authority’to mean in OCGA § 48-13-13 (5). Specifically,
we apply the fundamental rules of statutory construction that require us to construe [the] statute according to its terms, to give words their plain and ordinary meaning, and to avoid a construction that makes some language mere surplusage. At the same time, we must seek to effectuate the intent of the legislature.
(Citations omitted.) Slakman v. Continental Cas. Co., 277 Ga. 189, 191 (587 SE2d 24) (2003). Where, as here, the term “local authority’ is undefined and its plain meaning is not made clear from the language in OCGA § 48-13-13 (5) itself, “the cardinal rule is to glean the intent of the legislature.” (Citation and punctuation omitted.) Retention Alternatives, Ltd. v. Hayward, 285 Ga. 437, 438 (1) (678 SE2d 877) (2009). To do this, we must presume that the statute was
enacted by the legislature with full knowledge of the existing condition of the law and with reference to it. It is therefore to be construed in connection and in harmony with the existing law, and as a part of a general and uniform system of jurisprudence, and its meaning and effect is to be determined in connection, not only with the common law and the constitution, but also with reference to other statutes and the decisions of the courts.
(Citations and punctuation omitted; emphasis supplied.) Id. at 440 (2).
Accordingly our task here is to determine the consistent intent of the Legislature as it relates to whether a “municipality’ should properly be considered to be a “local authority’ for purposes of Georgia’s Public Revenue Code. In this connection, the Legislature has provided this Court with guidance in other sections of the Public Revenue Code to indicate that it specifically did not intend for the term “local authority’ to include a “municipality,” and that a “local authority’ and a “municipality’ are separate and distinct entities for purposes of the Public Revenue Code. See generally OCGA § 48-13-51 (a) (3), (3.4), and (3.7) (multiple references to “[a] county or municipality’ being authorized to levy a hotel tax for purposes of “supporting a facility owned or operated by a local government or local authority”) (emphasis supplied). See also OCGA § 48-13-51 (a) (4.4) (“[Municipalities within a county [with] community auditorium or theater *745facilities owned and operated by the municipality or by a local authority . . . may levy a [hotel] tax under this Code section.”) (emphasis supplied); OCGA § 48-8-111 (a) (1) (D) (With respect to a special purpose local option sales tax, “the governing authorities of the county and of each qualified municipality” may apply the tax proceeds toward “[a] capital outlay project or projects, to be owned or operated or both either by the county, one or more qualified municipalities within the special district, one or more local authorities within the special district, or any combination thereof.”) (emphasis supplied). This interpretation is underscored by the Legislature’s choice to specifically define a “local authority” as a separate entity from a “local government” in areas of the Georgia Code dealing specifically with local governments. See OCGA § 36-80-17 (a) (“[T]he term ‘local authority’ means an instrumentality of one or more local governments created to fulfill a specialized public purpose or any other legally created organization that has authority to issue debt for a public purpose independent of a county or municipality.”) (emphasis supplied). Atlanta’s arguments to the contrary do not show that the Legislature intended for the terms “local authority” and “municipality’ to be one and the same for purposes of the section of the Public Revenue Code at issue here. See generally OCGA § 48-13-13.
As a result, we conclude that the Court of Appeals was correct in its determination that the City of Atlanta was not a “local authority” as that term is used in OCGA § 48-13-13 (5).
Judgment affirmed.
All the Justices concur, except Benham, J., who dissents.OCGA § 48-13-13 (5) states in relevant part that “[l]ocal governments are not authorized to . . . D]evy any occupation tax, regulatory fee, or administrative fee on any state or local authority.”