'Batement light' definitions:
Definition of 'Batement light'
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Batement \Bate"ment\, n. [For Abatement. See 2d Bate.]
Abatement; diminution. --Moxon.
[1913 Webster]
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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.
[1913 Webster]
