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4 definitions found
 for hello
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 WordNet (r) 3.0 (2006) :

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

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

From The Free On-line Dictionary of Computing (30 December 2018) :

  hello, world
      The canonical, minimal, first program that a
     programmer writes in a new programming language or development
     environment.  The program just prints "hello, world" to standard
     output in order to verify that the programmer can successfully
     edit, compile and run a simple program before embarking on
     anything more challenging.
     Hello, world is the first example program in the C programming
     book, K&R, and the tradition has spread from there to pretty
     much every other language and many of their textbooks.
     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.
     Hello, World in over 400 programming languages

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