The number represented by the Arabic numeral 1; the numerical value equal to that cardinal number.
The first positive number in the set of natural numbers.
The cardinality of the smallest nonempty set.
The ordinality of an element which has no predecessor, usually called first or number one.

(impersonal, indefinite, pronoun) One thing (among a group of others); one member of a group.
(impersonal, pronoun, sometimes, with-definite-article) The first mentioned of two things or people, as opposed to the other.
(indefinite, personal, pronoun) Any person (applying to people in general).
(pronoun) Any person, entity or thing.

The digit or figure 1.
(US) Used to briefly refer to a noun phrase understood by context
Used to briefly refer to a noun phrase understood by context
Used to briefly refer to a noun phrase understood by context
Used to briefly refer to a noun phrase understood by context
Used to briefly refer to a noun phrase understood by context
Used to briefly refer to a noun phrase understood by context
A person or thing (having some specified characteristic or attribute).
A person or thing (having some specified characteristic or attribute).
(archaic, endearing, ironic) A person or thing (having some specified characteristic or attribute).
(colloquial) A particularly special or compatible person or thing.
(dated, derogatory, euphemistic) A gay person.
The identity element with respect to multiplication in a ring.
(Internet, Leet, alt-of, deliberate, misspelling, sarcastic) Deliberate misspelling of !, used to amplify an exclamation, parodying unskilled typists who forget to press the shift key while typing exclamation points, thus typing "1".

To cause to become one; to gather into a single whole; to unite.

(Manglish, Singlish) Used at the end of a sentence to highlight the characteristics of someone or something.
(Manglish, Singlish) Used at the end of a sentence to highlight the originator of something.
(Manglish, Singlish) Used at the end of a sentence to highlight the likelihood of something occurring, as a characteristic of something else.
(Manglish, Singlish) A nominalizer used to form a noun phrase without a head noun.

Used as a relative pronoun at the end of a relative clause.