B2 (of situations) not formal or official, or (of clothing, behaviour, speech) suitable when you are with friends and family but not for official occasions非正式的,非正规的;(服装)日常使用的;(言行)随意的
More examples
What was once an informal event has now become institutionalized.
People chatting at a party will usually be talking in an informal register.
Many informal expressions are gaining currency in serious newspapers.
The party itself was a fairly informal affair.
They started as informal gatherings but they have become increasingly formalized in the last few years.
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