Informal means relaxed, and not following strict rules. An informal meeting, informal dress, informal language.
It covers occasions, clothing and language. In writing, informal register uses contractions, phrasal verbs and shorter sentences, and choosing the wrong register is the commonest fault in learner writing. An informal arrangement is one with no contract behind it, which is a real distinction in law. Note informally; and formal, which does the opposite work.
1adjectiveinformalRelaxed, and not following strict rules.
“The meeting was informal, so we just chatted over coffee in the kitchen.”
synonyms: casual, relaxed
informal is a quality of relaxedness.
Latin
fōrmālis
Old French
formel
Middle English
formel
English
formal
English, today
informal
Built from
From in- + formal. formal comes from Middle English formel, borrowed from Old French formel, from Latin fōrmālis, from fōrma (“form”); equivalent to form + al.
Etymology from Wiktionary, CC BY-SA