informal, chiefly Brit. <非正式, 主英>
- done, made, or happening only once and not repeated一次性的：
one-off tax deductible donations to charity.
一次性的可减税慈善捐赠。
1
- something done, made, or happening only once, not as part of a regular sequence一次性事物：
the meeting is a one-off.
会议是一次性的。
1.1
- a person who is unusual or unique, especially in an admirable way独一无二的人：
he's a one-off, no one else has his skills.
他是独一无二的, 没人有他那样的技术。