British English spelling; a series of alternating open notches and raised sections along a fortification's top edge.
British variant of 'crenelation,' formed from the British 'crenellate' with '-tion' suffix. The double-'l' is maintained even as the suffix is added, following British morphological conventions.
British spelling keeps that extra 'l' even through conjugation—'crenellation' with two 'l's is like the linguistic equivalent of keeping your tea pinky up while discussing castle defenses!
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