From The Collaborative International Dictionary of English v.0.48:

Generation \Gen`er*a"tion\, n. [OE. generacioun, F.
   g['e]n['e]ration, fr.L. generatio.]
   1. The act of generating or begetting; procreation, as of
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   2. Origination by some process, mathematical, chemical, or
      vital; production; formation; as, the generation of
      sounds, of gases, of curves, etc.
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   3. That which is generated or brought forth; progeny;
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   4. A single step or stage in the succession of natural
      descent; a rank or remove in genealogy. Hence: The body of
      those who are of the same genealogical rank or remove from
      an ancestor; the mass of beings living at one period;
      also, the average lifetime of man, or the ordinary period
      of time at which one rank follows another, or father is
      succeeded by child, usually assumed to be one third of a
      century; an age.
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            This is the book of the generations of Adam. --Gen.
                                                  v. 1.
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            Ye shall remain there [in Babylon] many years, and
            for a long season, namely, seven generations.
                                                  --Baruch vi.
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            All generations and ages of the Christian church.
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   5. Race; kind; family; breed; stock.
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            Thy mother's of my generation; what's she, if I be a
            dog?                                  --Shak.
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   6. (Geom.) The formation or production of any geometrical
      magnitude, as a line, a surface, a solid, by the motion,
      in accordance with a mathematical law, of a point or a
      magnitude; as, the generation of a line or curve by the
      motion of a point, of a surface by a line, a sphere by a
      semicircle, etc.
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   7. (Biol.) The aggregate of the functions and phenomene which
      attend reproduction.
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   Note: There are four modes of generation in the animal
         kingdom: scissiparity or by fissiparous generation,
         gemmiparity or by budding, germiparity or by germs, and
         oviparity or by ova.
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   Alternate generation (Biol.), alternation of sexual with
      asexual generation, in which the products of one process
      differ from those of the other, -- a form of reproduction
      common both to animal and vegetable organisms. In the
      simplest form, the organism arising from sexual generation
      produces offspiring unlike itself, agamogenetically.
      These, however, in time acquire reproductive organs, and
      from their impregnated germs the original parent form is
      reproduced. In more complicated cases, the first series of
      organisms produced agamogenetically may give rise to
      others by a like process, and these in turn to still other
      generations. Ultimately, however, a generation is formed
      which develops sexual organs, and the original form is

   Spontaneous generation (Biol.), the fancied production of
      living organisms without previously existing parents from
      inorganic matter, or from decomposing organic matter, a
      notion which at one time had many supporters; abiogenesis.
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