Definition of F1:

Used for convenience to denote the first filial generation, or the hybrids arising from a first cross, successive generations arising from this one being denoted by F2, F3, etc. P1 denotes the parents of the F1 generation, P2 the grandparents, and so on.

Usage examples for F1:

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The act of separating; the thing separated; a body of troops, or certain ships, separated from the main body and sent on special service. ...