1. Well-being. 2. Suitability. 3. In population genetics, a measure of the relative survival and reproductive success of a given individual or phenotype, or of a population subgroup. 4. A set of attributes, primarily respiratory and cardiovascular, relating to ability to perform tasks requiring expenditure of energy.
clinical f. absence of frank disease or of subclinical precursors.
evolutionary f. the probability that the line of descent from an individual with a specific trait will not eventually die out.
genetic f. in a phenotype, the mean number of surviving offspring that it generates in its lifetime, usually expressed as a fraction or percentage of the average genetic f. of the population.
physical f. a state of well-being in which performance is optimal.
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