Definition of "us"

us¹

/ʌs/

pronoun
1. (personal) Me and at least one other person; the objective case of we.
  Quotations
  Forasmuch as many have taken in hand to set forth in order a declaration of those things which are most surely believed among us...
  1611, The Holy Bible, […] (King James Version), London: […] Robert Barker, […], Luke 1:1
2. (Commonwealth, colloquial, chiefly with give) Me.
3. (Northern England) Our.
4. (Northumbria) Me (in all contexts).
determiner
1. The speakers/writers, or the speaker/writer and at least one other person.

us²

symbol
1. Alternative spelling of µs: microsecond
  Quotations
  ;wait 500 us
  2002, Peter Spasov, Microcontroller Technology, the 68HC11, page 489
  The standard units are ns (nanoseconds), us (microseconds), ms (milliseconds), sec (seconds), min (minutes), and hr (hours).
  2012, Peter Feiler, David Gluch, Model-Based Engineering with AADL
  Because the flash devices are local to the server, the latencies can be microseconds (us) instead of milliseconds (ms) and eliminate some traffic that would normally have gone over the storage network.
  2014, Michael Corey, Jeff Szastak, Michael Webster, Virtualizing SQL Server with VMware: Doing IT Right, page 198

us³

noun
1. (rare) Alternative form of u's.