DictionaryRoot: acointer
Old French
acointer
make known
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noun
acquaintance
uh-KWAYN-tuns/əˈkweɪntəns/
Familiarity gained through limited personal contact.
Etymology
The pieces describe the state of knowing someone. This abstract sense of familiarity was then applied to the person known, providing the bridge to today's meaning of someone known but not closely.