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| fac·ul·ta·tive [ fák'l tàytiv ] |
adjective |
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1. allowing something to happen: enabling or capable of permitting something to happen or be done, but not able to force its occurrence
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2. not required: optional, not obligatory
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3. biology associated with variety of conditions: able to live or take place under a range of external conditions
See also obligate
 a facultative parasite
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| fac·ul·ta·tive·ly adverb |
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