What is the meaning of ال?

the

Aaron Rubin (2005), “Definite Articles”, in Studies in Semitic Grammaticalization, Brill, →DOI, →ISBN, pages 77-78

mouse

fifty

the definite article; the

  1. Used to prompt the interlocutor to state their family name

    Used to prompt the interlocutor to state their family name

    the relative clause; that, who, which, etc

    to (destination)

    the definite article; the

    wet

    he, she, it

    that

    that

    Arabic spelling of əl (hand)

    the

    contraction of اللي

    contraction of اللي

    hand

    the

    the

    Used before abstract nouns; not translated in English.

    plough; the beam of a plough

    Source: wiktionary.org