The act of accepting; a receiving of something offered, with acquiescence, approbation, or satisfaction; especially, favourable reception; approval.

“the acceptance of a gift, office, doctrine, etc.”

Belief in something; agreement, assent.

The state of being accepted.

A conserved property of the light in an optical system which characterizes how "spread out" the light is in terms of angle and area: it is the product of its cross-sectional area (normal to the direction of propagation) and the solid angle it subtends.