Definitions
1.VerbTo reveal, uncover, make visible, bring to light, introduce (to).
2.VerbTo subject photographic film to light thereby recording an image.
3.VerbTo abandon, especially an unwanted baby in the wilderness.
4.VerbTo submit to an active (mostly dangerous) substance like an allergen, ozone, nicotine, solvent, or to any other stress, in order to test the reaction, resistance, etc.
5.VerbTo make available to other parts of a program, or to other programs.