Source : Webster's Revised Unabridged Dictionary (1913)

We \We\ (w[=e]), pron.; pl. of I. [Poss. {Our} (our) or {Ours}
   (ourz); obj. {Us} ([u^]s). See {I}.] [As. w[=e]; akin to OS.
   w[=i], OFries. & LG. wi, D. wij, G. wir, Icel. v[=e]r, Sw. &
   Dan. vi, Goth. weis, Skr. vayam. [root]190.]
   The plural nominative case of the pronoun of the first
   person; the word with which a person in speaking or writing
   denotes a number or company of which he is one, as the
   subject of an action expressed by a verb.

   Note: We is frequently used to express men in general,
         including the speaker. We is also often used by
         individuals, as authors, editors, etc., in speaking of
         themselves, in order to avoid the appearance of egotism
         in the too frequent repetition of the pronoun I. The
         plural style is also in use among kings and other
         sovereigns, and is said to have been begun by King John
         of England. Before that time, monarchs used the
         singular number in their edicts. The German and the
         French sovereigns followed the example of King John in
         a. d. 1200.

Us \Us\, pron. [OE. us, AS. ?s; akin to OFries. & OS. ?s, D.
   ons, G. uns, Icel. & Sw. oss, Dan. os, Goth. uns, L. nos we,
   us, Gr. ? we, Skr. nas us. ????. Cf. {Nostrum}, {Our}.]
   The persons speaking, regarded as an object; ourselves; --
   the objective case of we. See {We}. ``Tell us a tale.''
   --Chaucer.

         Give us this day our daily bread.        --Matt. vi.
                                                  11.

I \I\ ([imac]), pron. [poss. {My} (m[imac]) or {Mine}
   (m[imac]n); object. {Me} (m[=e]). pl. nom. {We} (w[=e]);
   poss. {Our} (our) or {Ours} (ourz); object. {Us} ([u^]s).]
   [OE. i, ich, ic, AS. ic; akin to OS. & D. ik, OHG. ih, G.
   ich, Icel. ek, Dan. jeg, Sw. jag, Goth. ik, OSlav. az', Russ.
   ia, W. i, L. ego, Gr. 'egw`, 'egw`n, Skr. aham. [root]179.
   Cf. {Egoism}.]
   The nominative case of the pronoun of the first person; the
   word with which a speaker or writer denotes himself.

Source : WordNet®

US
     n : 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 [syn: {United
         States}, {United States of America}, {America}, {U.S.}, {USA},
          {U.S.A.}]

Source : Free On-Line Dictionary of Computing

US
     
        {Unit Separator}

us
     
         The {country code} for the United States.
     
        Usually used only by schools, libraries, and some state and
        local governments.  Other US sites, and many international
        ones, use the non-national {top-level domains} .com, .edu etc.
     
        (1999-01-27)