What is the meaning of The?

Used before a noun phrase, including a simple noun

1. The definite grammatical article that implies necessarily that the noun phrase it immediately precedes is definitely identifiable
   1. because it has already been mentioned, is to be completely specified in the same sentence, or very shortly thereafter.

      The definite grammatical article that implies necessarily that the noun phrase it immediately precedes is definitely identifiable

      1. because it has already been mentioned, is to be completely specified in the same sentence, or very shortly thereafter.

         because it has already been mentioned, is to be completely specified in the same sentence, or very shortly thereafter.

         because it is presumed to be definitely known in context or from shared knowledge

         1. Used before a noun designating something considered to be unique, or of which there is only one at a time.

            Used before a noun designating something considered to be unique, or of which there is only one at a time.

            Used to indicate a certain example of (a noun) which is usually of most concern or most common or familiar.

            Used before a body part, a family member, a pet (especially of someone previously mentioned), as an alternative to a possessive pronoun.

            Precedes a familiar nickname or other term of address.

            Used in many idiomatic expressions and proverbs to refer to common objects, roles, or situations connected with something definite, as by analogy

            When stressed, indicates that it describes something which is considered to be best or exclusively worthy of attention.

            Used before a noun phrase beginning with superlative or comparative adjective or an ordinal number, indicating that the noun refers to a single item.

            Introducing a singular term to be taken generically: preceding a name of something standing for a whole class.

            Used with the plural of a surname to indicate the entire family.

            Used with an adjective

            1. Added to a superlative or an ordinal number to make it into a substantive.

               Added to a superlative or an ordinal number to make it into a substantive.

               Used before an adjective, indicating all things (especially persons) described by that adjective.

               ↑ Dunkel, George E. (2014) Lexikon der indogermanischen Partikeln und Pronominalstämme [Lexicon of Indo-European Particles and Pronominal Stems] (Indogermanische Bibliothek. 2. Reihe: Wörterbücher) (in German), Heidelberg: Universitätsverlag Winter GmbH Heidelberg, →ISBN, pages 732-733

               With a comparative or with more and a verb phrase, establishes a correlation with one or more other such comparatives.

               With a comparative, and often with for it, indicates a result more like said comparative. This can be negated with none.

               Beyond all others.

               For each; per.

               A topology name.

               the

               I (first person singular pronoun)

               you (thou)

               Alternative form of þe (“the”)

               Alternative form of þe (“thee”)

               Alternative form of þei (“they”)

               Alternative form of theen

               ear

               that, who, which

               Braune, Wilhelm. Althochdeutsches Lesebuch, zusammengestellt und mit Glossar versehen

               that, that one

               that, who, which

               belt

               Alternative form of a (“the”)

               Alternative spelling of te (“tea”)

               tea

               Lenited form of te.

               Misspelling of tè.

               the

               Alternative spelling of da

               Alternative spelling of te (tea)

               a kind of silk gauze

               having a strong and fragrant smell or flavor, usually overlaps with what described as "minty" or "citrusy" in English

               Aspirate mutation of te.

               Source: wiktionary.org