| fitness | 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. (05 Mar 2000) |
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| genetic fitness | 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 fitness of the population. (05 Mar 2000) |
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| clinical fitness | Absence of frank disease or of subclinical precursors. (05 Mar 2000) |
| physical fitness | A state of well-being in which performance is optimal, often as a result of physical conditioning which may be prescribed for disease therapy. (12 Dec 1998) |
| evolutionary fitness | The probability that the line of descent from an individual with a specific trait will not eventually die out. (05 Mar 2000) |