| requirement | 1. Something needed. 2. A condition. (05 Mar 2000) |
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| minimum protein requirement | <nutrition> The age-dependent amount of protein required daily in the diet. (05 Mar 2000) |
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| serum requirement | The amount of serum that must be added to culture medium to permit growth of an animal cell in culture. Transformed cells frequently have less stringent serum requirements than their normal counterparts. (18 Nov 1997) |
| quantum requirement | The number of quanta of light absorbed required for the transformation of one molecule; the inverse of the quantum yield. (05 Mar 2000) |