1. Having four equal sides and four right angles; square.
2. Marked by firm, unwavering conviction or expression; forthright: a foursquare refusal to yield.
3. Of or being a style of American residential architecture popular especially in the early 20th century, usually having two and a half stories and characterized by a square boxy shape and a four-room floor plan.
In a forthright manner; squarely.
A child's game in which each of four players stands in one of four boxes drawn on the ground in a two-by-two grid and must bounce a ball into another player's box without holding the ball or stepping out of bounds.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.