Definify.com

Webster 1913 Edition

Noun.

[For

. See 2d

Abatement; diminution.

Moxon.

Batement light

(Arch.)

a window or one division of a window having vertical sides, but with the sill not horizontal, as where it follows the rake of a staircase.

Noun.

Abatement; deduction; diminution. [Bate, with its derivatives, is, I believe, little used, or wholly obsolete in the United States.]

batement ‎(plural batements)