Etymology
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battlement (n.)

"an indented parapet in fortifications," early 14c., from Old French bataillement, earlier bastillement "fortification," from bastillier "to fortify, to equip with battlements," from bastille "fortress, tower" (see bastion). The raised parts are cops or merlons; the indentations are embrasures or crenelles.

updated on April 17, 2017

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Definitions of battlement from WordNet

battlement (n.)
a rampart built around the top of a castle with regular gaps for firing arrows or guns;
Synonyms: crenelation / crenellation
From wordnet.princeton.edu, not affiliated with etymonline.