(idea) by Teiresias Wed Nov 01 2000 at 10:00:11
The common definition of fertilisation is

'The union of male and female cells (e.g. sperm and egg) to form a new individual'.

Other definitions exist, especially amongst medical pratitioners when speaking about human reproduction. One of the more common views is that fertilisation doesn't take place until around 20 hours after cell collision (correctly known as syngamy), as at this point the cells swap chromosomes, and cell division starts

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