: not formal: such as
a
: having a friendly and relaxed quality
an informal party
We had an informal meeting over lunch.
an informal conversation
an informal writing style
He has an informal manner that puts people at ease.
b
: suited for ordinary use when you are relaxing
informal clothes
an informal dining area
c
of language
: relaxed in tone : not suited for serious or official speech and writing
He spoke to them in informal Spanish/English.
The term is common in informal contexts.
informal language/speech/writing
an informal word
d
: done in a way that is not especially careful or scientific
He took an informal poll/survey among his coworkers.
Cite this Entry
“Informal.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/informal. Accessed 19 Jun. 2026.
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