Definition of dilate

• v. t. - To expand; to distend; to enlarge or extend in all directions; to swell; -- opposed to contract; as, the air dilates the lungs; air is dilated by increase of heat.
• v. t. - To enlarge upon; to relate at large; to tell copiously or diffusely.
• v. i. - To grow wide; to expand; to swell or extend in all directions.
• v. i. - To speak largely and copiously; to dwell in narration; to enlarge; -- with on or upon.
• a. - Extensive; expanded.