Us has 8 different meanings across 5 categories:
Noun · Proper Noun · Pron · Det · Symbol
North American republic containing 50 states - 48 conterminous states in North America plus Alaska in northwest North America and the Hawaiian Islands in the Pacific Ocean; achieved independence in 1776
Initialism of unconditioned stimulus.
plural of u
Abbreviation of unserviceable.
Initialism of United States.
Me and at least one other person; the objective case of we.
The speakers/writers, or the speaker/writer and at least one other person.
Alternative spelling of µs: microsecond