hello

from WordNet (r) 3.0 (2006)

hello
    n 1: an expression of greeting; "every morning they exchanged
         polite hellos" [syn: {hello}, {hullo}, {hi}, {howdy}, {how-
         do-you-do}]

from The Collaborative International Dictionary of English v.0.48

Hello \Hel*lo"\, interj. & n.
   An exclamation used as a greeting, to call attention, as an
   exclamation of surprise, or to encourage one. This variant of
   {Halloo} and {Holloo} has become the dominant form. In the
   United States, it is the most common greeting used in
   answering a telephone.
   [1913 Webster +PJC]

from The Free On-line Dictionary of Computing (8 July 2008)

hello, world
hello

   <programming> The canonical minimal test message in the
   {C}/{Unix} universe or any of the minimal programs that emit
   this message.

   Traditionally, the first program a C coder writes in a new
   environment is one that just prints "hello, world" to standard
   output (and indeed it is the first example program in {K&R}).

   Environments that generate an unreasonably large executable
   for this trivial test or which require a {hairy}
   compiler-linker invocation to generate it are considered bad.

   (2007-10-30)

from Moby Thesaurus II by Grady Ward, 1.0

19 Moby Thesaurus words for "hello":
      accost, address, bob, bow, curtsy, embrace, greeting, hail,
      hand-clasp, handshake, how-do-you-do, hug, kiss, nod, salutation,
      salute, smile, smile of recognition, wave