DictionaryacquaintancePerson known slightly
noun

acquaintance

uh-KWAYN-tuns/əˈkweɪntəns/

Familiarity gained through limited personal contact.

Their slight acquaintance is enough for a friendly wave as they pass.

Two neighbors who know each other only slightly exchange a brief friendly wave while passing, no intimate embrace or close shared activity.
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.

In context

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apologize to the other for so doing whether he is an acquaintance or a stranger
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More examples

  • An old acquaintance waves to me from the café.
  • The class assumes no prior acquaintance with computer programming.
  • We remain friendly acquaintances rather than close friends.

Forms

acquaintance · acquaintances

acquaint verb — To make someone familiar with something.

Similar words

familiarity
Can imply deeper experience than limited personal contact.
friend
Usually names someone with a closer personal relationship.