compel

from The American Heritage® Dictionary of the English Language, 4th Edition

• transitive v. To force, drive, or constrain: Duty compelled the soldiers to volunteer for the mission.
• transitive v. To necessitate or pressure by force; exact: An energy crisis compels fuel conservation. See Synonyms at force.
• transitive v. To exert a strong, irresistible force on; sway: "The land, in a certain, very real way, compels the minds of the people” ( Barry Lopez).

from Wiktionary, Creative Commons Attribution/Share-Alike License

• v. (literally) To drive together, round up
• v. To overpower; to subdue
• v. To force, constrain or coerce
• v. To exact, extort, (make) produce by force

from the GNU version of the Collaborative International Dictionary of English

• transitive v. To drive or urge with force, or irresistibly; to force; to constrain; to oblige; to necessitate, either by physical or moral force.
• transitive v. To take by force or violence; to seize; to exact; to extort.
• transitive v. To force to yield; to overpower; to subjugate.
• transitive v. To gather or unite in a crowd or company.
• transitive v. To call forth; to summon.
• intransitive v. To make one yield or submit.

from The Century Dictionary and Cyclopedia

• To drive or urge with force or irresistibly; constrain; oblige; coerce, by either physical or moral force: as, circumstances compel us to practise economy.
• To subject; force to submit; subdue.
• To take by force or violence; wrest; extort.
• To drive together; unite by force; gather in a crowd or company; herd.
• To overpower; overcome; control.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• v. force somebody to do something
• v. necessitate or exact