Initialism of United States.

(psychology) Initialism of unconditioned stimulus.

Alternative spelling of U.S. of A.

Alternative spelling of µs: microsecond

(rare) Alternative form of u's.

Contraction of us is.

(personal) Me and at least one other person; the objective case of we. / (Commonwealth of Nations, colloquial, chiefly with give) Me. / (Northern England) Our. / (Tyneside) Me (in all contexts).

The speakers/writers, or the speaker/writer and at least one other person.

The act of using. / (uncountable) The act of consuming alcohol or narcotics. / (uncountable, followed by "of") Usefulness, benefit. / A function; a purpose for which something may be employed.

pointless, useless; not worth doing, especially because it is not likely to succeed / (colloquial) No point or advantage.