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Webster 1913 Edition

Noun.

[L.

cooptatio

The act of choosing; selection; choice.

[Obs.]

The first election and

cooptation

of a friend.

Howell.

See also: cooptation and co-optation

coöptation ‎(uncountable)

Alternative form of cooptation
- 1908, Abbott Lawrence Lowell, The Government of England, page #481:
  It may be observed that the draft rules make no provision for coöptation, an arrangement that appears nevertheless in the rules of many local associations.