Webster's Revised Unabridged Dictionary · 1913

Dilate

Dilate (?; 277) , transitive verb

[Latin dilatare; either from di- = dis- + latus wide, not the same word as latus, used as past participle of ferre to bear (see Latitude); or from dilatus, used as past participle of differre to separate (see Delay, Tolerate, Differ, and compare Dilatory): compare French dilater.]

1.
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.
2.
To enlarge upon; to relate at large; to tell copiously or diffusely. [Rare]
Do me the favor to dilate at full What hath befallen of them and thee till now. — Shakespeare

Dilate , intransitive verb

1.
To grow wide; to expand; to swell or extend in all directions.
His heart dilates and glories in his strength. — Addison
2.
To speak largely and copiously; to dwell in narration; to enlarge; -- with on or upon.
But still on their ancient joys dilate. — Crabbe

Dilate , adjective

Extensive; expanded. [Obsolete] — B. Jonson