Definition of "equilateral" [e•qui•lat•er•al]

• Having all sides or faces equal. (adjective)
• A side exactly equal to others. (noun)
• A geometric figure having all sides equal. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Ensure that the octagon is equilateral, meaning all sides on the ground have the same length."
• "a tiny mining company working claims in the remote "equilateral" cluster of asteroids far out in Jupiter's orbit."
• "It happened that the Lancashire Queen, the shore at Turner's Shipyard, and the Solano Wharf were the corners of a big equilateral triangle."