facultative

adj. making possible, allowing; optional; possible; able to exist in more than one set of environmental conditions (Biology)

Adjective
1. of or relating to the mental faculties
(pertainym) faculty, mental faculty, module
2. able to exist under more than one set of conditions; "a facultative parasite can exist as a parasite or a saprophyte"
(antonym) obligate
(classification) biology, biological science
3. granting a privilege or permission or power to do or not do something; "a facultative enactment"
(similar) enabling
4. not compulsory; "facultative courses in the sciences"
(similar) optional

adj. facultative, optional, permissive

facultative
tính từ tuỳ ý, không bắt buộc ngẫu nhiên, tình cờ (thuộc) khoa (đại học)
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FACOLTATIVO. EVENTUALE. POSSIBILE