[1] : The Collaborative International Dictionary of English v.0.48

omega \ome"ga\ =om=e"g.a or =om=a"g.a or
   =o"m-eg.a; 277, n. nl., fr. gr. 'w^ me`ga, i.e., the
   great or long o. cf. mickle.
   1. the last letter of the greek alphabet. see alpha.
      1913 webster

   2. the last; the end; hence, death.
      1913 webster

            "omega thou art lord," they said.    --tennyson.
      1913 webster

   alpha and omega, the beginning and the ending; hence, the
      chief, the whole. --rev. i. 8.
      1913 webster

            the alpha and omega of science.       --sir j.
                                                  herschel.
      1913 webster
see also:
mickle alpha alpha and omega 

[2] : WordNet (r) 2.0

alpha and omega
     n 1: the first and last; signifies god's eternity
     2: the basic meaning of something; the crucial part

Alpha And Omega >> A Words
Alpha And Omega, definition of term: Alpha And Omega
alpha+and+omega_pag1.html

Alpha >> A Words
Alpha, definition of term: Alpha
alpha_pag1.html

Alpha Test >> A Words
Alpha Test, definition of term: Alpha Test
alpha+test_pag1.html

Alpha Wave >> A Words
Alpha Wave, definition of term: Alpha Wave
alpha+wave_pag1.html

Alpha Radiation >> A Words
Alpha Radiation, definition of term: Alpha Radiation
alpha+radiation_pag1.html

Alpha Particle >> A Words
Alpha Particle, definition of term: Alpha Particle
alpha+particle_pag1.html

Alpha Geek >> A Words
Alpha Geek, definition of term: Alpha Geek
alpha+geek_pag1.html

Alpha Centauri >> A Words
Alpha Centauri, definition of term: Alpha Centauri
alpha+centauri_pag1.html

Dec Alpha >> D Words
Dec Alpha, definition of term: Dec Alpha
dec+alpha_pag1.html