preformation

pre·for·ma·tion

[pree-fawr-mey-shuhn]
noun
1.
previous formation.
2.
Biology. (formerly) the theory that the individual, with all its parts, preexists in the germ cell and grows from microscopic to normal proportions during embryogenesis ( opposed to epigenesis ).

Origin:
1725–35; pre- + formation

pre·for·ma·tion·ar·y, adjective
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Collins
World English Dictionary
preformation (ˌpriːfɔːˈmeɪʃən) [Click for IPA pronunciation guide]
 
n
1.  the act of forming in advance; previous formation
2.  biology Compare epigenesis the theory, now discredited, that an individual develops by simple enlargement of a fully differentiated egg cell

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Preformation is always a great word to know.
So is fit. Does it mean:
a group of individuals or species having a common ancestry
adapting to the prevailing conditions and producing offspring that survive to reproductive age; contributing to the gene pool of the next generation
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