To allow to be done or occur.
From M.Fr. permetre, from L. permittere "give up, allow, allow to pass through," from per- "through;" (from PIE base *per- "through, across, beyond;" cf. Gk. peri "around, about, beyond;" O.Pers. pariy "around, about," Av. pairi "around, over;" Skt. pari; Indo-Iranian *pari- "around;" Mod.Pers. par-, pirâ- "around, about") + mittere "let go, send."
Parzâmidan, literally "to allow to go through," infinitive of parzâm, from par- "through," from O.Pers. pariy "around, about," Av. pairi "around, over," cognet with L. per-, as above + zâm stem of Mid.Pers. zâmenidan "to let go, lead, send," Mod.Pers. gâm "step, pace," âmadan "to come;" O.Pers./Av. gam- "to come; to go," Av. jamaiti "goes;" cf. Skt. gamati "goes;" Gk. bainein "to go, walk, step," L. venire "to come;" Tocharian A kÃ¤m- "to come;" O.H.G. queman "to come," E. come; PIE base *gwem- "to go, come."
Allowed. → permitted line; → permitted transition.
Past participle of → permit.
Fr.: raie permise
An ordinary spectral line emitted by atoms undergoing energy transitions that are allowed by the selection rules of quantum mechanics. → forbidden lines.
Fr.: transition permise
A transition between two quantum mechanical states that does not violate the quantum mechanical selection rules.
→ permitted; → transition.
A measure of the ability of a material to transmit (or "permit") an electric field. Permittivity is defined as the ratio of the flux density produced by an electric field in a given dielectric to the flux density produced by that field in a vacuum. In → SI units, permittivity is measured in → farads per meter. The constant ε0 is known as the permittivity of free space; its value is about 8.854 x 10-12 F/m.
State or quality noun from → permit.