(1):

(v. t.) To enlarge upon; to relate at large; to tell copiously or diffusely.

(2):

(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.

(3):

(v. i.) To grow wide; to expand; to swell or extend in all directions.

(4):

(a.) Extensive; expanded.

(5):

(v. i.) To speak largely and copiously; to dwell in narration; to enlarge; - with on or upon.