Third-person singular simple present indicative form of darken

(transitive) To make dark or darker by reducing light. / (intransitive) To become dark or darker (having less light).

Made dark or lightproof by the exclusion of light. / Having an absence of light, such as at night-time.

simple past tense and past participle of darken

The act of something becoming darker.

present participle of darken

plural of darkener

One who or that which darkens.

plural of darkening

(physics, astronomy) The phenomenon of a star rotating so rapidly that it is oblate, with a larger radius and thus lower surface gravity at the equator (which is thus cooler and darker: gravity-darkened), and higher surface gravity at the poles (which are hotter and brighter: gravity brightened).