- the return of light, heat, sound, etc., after striking a surface.
- something so reflected, as heat or especially light.
- (in a plane) the replacement of each point on one side of a line by the point symmetrically placed on the other side of the line.
- (in space) the replacement of each point on one side of a plane by the symmetric point on the other side of the plane.
- reflect on,
- reflected plan,
- reflecting telescope,
- reflection coefficient,
- reflection density,
- reflection nebula,
- reflection plane,
Origin of reflection
less commonly reflexion
late 14c., reflexion, in reference to surfaces throwing back light or heat, from Late Latin reflexionem (nominative reflexio) "a reflection," literally "a bending back," noun of action from past participle stem of Latin reflectere "to bend back, bend backwards, turn away," from re- "back" (see re-) + flectere "to bend" (see flexible). Of the mind, from 1670s. Meaning "remark made after turning back one's thought on some subject" is from 1640s. Spelling with -ct- recorded from late 14c., established 18c., by influence of the verb.