facultative
/ˈfækəlˌteɪtɪv/
adjective
- Optional or not required; able to be chosen or not chosen.
- The course includes a facultative field trip that students can skip if they prefer.
- Attendance at the workshop is facultative, so only those interested need to come.
- The contract has a facultative clause allowing either party to withdraw without penalty.
- In biology, able to live or function in more than one way, especially under different environmental conditions.
- Some plants are facultative perennials, meaning they can act as annuals in harsh climates.
- The bacteria are facultative parasites, able to live independently or inside a host.
- Facultative anaerobes can survive with or without oxygen.
Antonyms