| three-digit number |
a whole number containing three digits, such as 365. |
| three-dimensional |
having or appearing in three dimensions; having depth as well as height and width. [2 definitions] |
| threefold |
having three parts or elements. [3 definitions] |
| three-four time |
see "three-quarter time." |
| three-mile limit |
the outer limit, under international law, of a country's jurisdiction extending from its coast. |
| threepence |
the sum of three British pence. [2 definitions] |
| threepenny |
costing or worth three pence. [2 definitions] |
| three-phase |
of, designating, or pertaining to an electrical circuit, system, or device powered by three alternating electromotive forces that differ in phase by one-third of a cycle, or 120 electrical degrees. |
| three-piece |
made of or having three parts. [2 definitions] |
| three-ply |
having three layers, strands, or the like bonded or woven together. |
| three-point landing |
a perfect aircraft landing in which the two main wheels and the tail or nose wheel touch down simultaneously. |
| three-point play |
in basketball, a play in which a player is fouled while making a two-point basket and then scores another point on the subsequent free throw. |
| three-quarter time |
a musical meter having three quarter notes or their equivalent in each measure; three-four time. |
| three-ring circus |
a circus having simultaneous performances in three separate rings. [2 definitions] |
| three R's |
reading, writing, and arithmetic, considered as the fundamentals of education. |
| threescore |
being three times twenty in number; sixty. |
| threesome |
a group of three people or things, as in a golf game. |
| three-way |
designed to operate in three ways, esp. as a light bulb or electrical switch that operates on three different wattages. |
| three-wheeler |
a vehicle with three wheels, such as a tricycle or some early or experimental cars. |
| threnody |
a poem or song of mourning; lamentation; dirge. |
| threonine |
an amino acid found in many proteins that is essential in the diet of humans but not essential in the diet of most animals. |