Etymology
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effacement (n.)

1743, from French effacement; see efface + -ment.

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Definitions of effacement

effacement (n.)
shortening of the uterine cervix and thinning of its walls as it is dilated during labor;
effacement (n.)
withdrawing into the background; making yourself inconspicuous;
Synonyms: self-effacement
From wordnet.princeton.edu