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transept (n.)

"transverse section of a cruciform church," 1530s, from Medieval Latin transeptum, from Latin trans "across, beyond" (see trans-) + saeptum "fence, partition, enclosure" (see septum). Rare before 1700. Related: Transeptal.

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Definitions of transept from WordNet

transept (n.)
structure forming the transverse part of a cruciform church; crosses the nave at right angles;
From wordnet.princeton.edu