An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

1a) General: To keep or protect from harm, decay, or destruction.
1b) Physics, chemistry: To maintain a quantity constant during an interaction or process of evolutionary change. → conservation law.
1c) To preserve (fruit) by cooking with sugar.
2) Fruit preserved by cooking with sugar.

M.E., from O.Fr. conserver, from L. conservare "to keep, preserve, guard," from → com- + servare "keep, watch, maintain," → observe.

Patâyândan, transitive of Mid.Pers. patâyidan "to endure, remain, continue," ultimately from Proto-Ir *pati-tauH-, from base *tauH- "to be able, strong;" cf. Av. tauu- "to be able, strong," O.Pers. tav- "to be strong," Pers. tavân "power," tavânestan "to be able," Skt. tav^i- "to be strong;" Gk. saos "healthy;" PIE *tuH- "to swell, be strong" (Cheung 2007).

A → quantity that remains → constant when its corresponding → physical system undergoes a → transformation.

→ conserve→ quantity.