1. Variant of terce.
2. A measure of liquid capacity, equal to a third of a pipe, or 42 gallons (159 liters).
3. Games A sequence of three cards of the same suit.
4. Sports The third position from which a parry or thrust can be made in fencing.
5. Music An interval of a third.
[Middle English, from Old French, from feminine of tiers, third, from Latin tertius; see trei- in the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.