Definition of "bi-" []

• Two: biform. (prefix)
• Both: binaural. (prefix)
• Both sides, parts, or directions: biconcave. (prefix)
• Occurring at intervals of two: bicentennial. (prefix)
• Usage Problem Occurring twice during: biweekly. (prefix)

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.

• "I think it's extremely important that whatever follows the MDGs moves beyond a list of non-binding, broad objectives, and that any targets agreed are better linked to binding international bi- tri- and multilateral agreements."
• "He wiggled his fingers, occasionally bent forward to stretch out his calves and thighs, or reached overhead with one hand to touch the other shoulder, stretching bi- and triceps."
• "The visible result of this phenomenon is the bulge of the bi- and triceps when we flex our muscles."