The is defined as an article and is used before a noun to specify, or put emphasis on, that noun.
(article)An example of "the" is saying that a particular bird is blue.
See the in Webster's New World College Dictionary
adjective, definite article
Origin: ME, indeclinable article < OE se (nom. masc. article) with th- < other case & gender forms (thone, thæs, thære, thæm, thy): for IE base see that; the meaning is controlled by the basic notion “previously recognized, noticed, or encountered” in distinction to a, an
adverb
See the in American Heritage Dictionary 4
def.art.
Origin:
Origin: Middle English
Origin: , from Old English the
Origin: , alteration (influenced by , th-, oblique case stem of demonstrative pron.)
Origin: of se, masculine demonstrative pron.; see so- in Indo-European roots
.adverb
Origin:
Origin: Middle English
Origin: , from Old English thȳ, thē
Origin: , instrumental of thǽt, neuter demonstrative pron.; see to- in Indo-European roots
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