Definitions
1.verbTo enlarge; to make bigger."The eye doctor put drops in my eye to dilate the pupil so he could see the nerve better."
2.verbTo become wider or larger; to expand."His heart dilates and glories in his strength."
3.verbTo speak largely and copiously; to dwell in narration; to enlarge; with "on" or "upon".
4.verbTo use a dilator to widen (something, such as a vagina).
5.verb(dismissal, 4chan) Expression of anger and contempt, specifically at transgender women.