Fr.: trop, très, en plus; par-dessus, partout
A prefixal use of over with the sense of "over the limit," "to excess," "too much" to form verbs, adjectives, adverbs, and nouns, e.g. → overabundance; → overdense; → overestimate.
O.E. ofer, from P.Gmc. *uberi (cf. O.S. obar, O.Fris. over, O.H.G. ubar, Ger. über, Goth. ufar "over, above"), from PIE *uper; cf. Gk. hyper, preposition and adverb, "over, beyond, overmuch, above;" cognate with L. super- and Pers. abar-, as below.
"much, more; in excess; great"
(from Mid.Pers. veš "more, longer; more frequently," related to
vas "many, much" (Mod.Pers. bas);
O.Pers. vasiy "at will, greatly, utterly;" Av. varəmi "I wish,"
vasô, vasə "at one's pleasure or will," from vas- "to will, desire,
To expose a detector to too much photons, resulting in saturation.
Excessive exposure of a detector, → over-expose.