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v. di·lat·ed, di·lat·ing, di·lates
To make wider or larger; cause to expand.
1. To become wider or larger; expand.
2. To speak or write at great length on a subject; expatiate.
[Middle English dilaten, from Old French dilater, from Latin dīlātāre, to enlarge : dī-, dis-, apart; see dis- + lātus, wide.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.