Definition of crenellate in English:
 crenellate
(also crenelate)
verb ˈkrɛn(ə)leɪtˈkrɛnəˌleɪt
[with object]usually as adjective crenellatedhistorical Provide (a wall of a building) with battlements.
 the abbey of Quarr had been licensed to crenellate its buildings
 Example sentencesExamples
-  The geometry of the rooflights gives the building a crenellated profile so it looms over its surroundings like a brooding castle battlement.
 -  It also required raising the limestone crenellated parapet that runs along the roof battlement.
 -  The glass structure that enclosed them had a crenellated top suggestive of historic armories.
 -  To the left of this tower are the walls that surround the basilica itself, as solid and crenellated as a castle keep.
 -  The tomb itself is almost like a miniature fortress, with sloping crenellated outer walls, complete with eyelets for archery.
 
Origin
  
Early 19th century: from French créneler, from Old French crenel (see crenel).
   Definition of crenellate in US English:
 crenellate
(also crenelate)
verbˈkrenəˌlātˈkrɛnəˌleɪt
[with object]usually as adjective crenellatedhistorical Provide (a wall of a building) with battlements.
 the abbey of Quarr had been licensed to crenellate its buildings
 Example sentencesExamples
-  It also required raising the limestone crenellated parapet that runs along the roof battlement.
 -  To the left of this tower are the walls that surround the basilica itself, as solid and crenellated as a castle keep.
 -  The tomb itself is almost like a miniature fortress, with sloping crenellated outer walls, complete with eyelets for archery.
 -  The glass structure that enclosed them had a crenellated top suggestive of historic armories.
 -  The geometry of the rooflights gives the building a crenellated profile so it looms over its surroundings like a brooding castle battlement.
 
Origin
  
Early 19th century: from French créneler, from Old French crenel (see crenel).