third dimension

WordReference Random House Unabridged Dictionary of American English © 2026

third′ dimen′sion, 

1. Physics the additional dimension by which a solid object is distinguished from a planar projection of itself or from any planar object.
2. something that heightens the reality, vividness, or significance of a factual account, sequence of happenings, etc.:
   The illustrations added a third dimension to the story.
• 1855–60

Collins Concise English Dictionary © HarperCollins Publishers::

third dimension noun

1. the additional dimension by which a solid object may be distinguished from a two-dimensional drawing or picture of it or from any planar object