An Etymological Dictionary of Astronomy and Astrophysics

1a) To bring together into a one body or place.

1b) To gather and gradually accumulate in a place.

2. to gather together; assemble.

Etymology (EN): From O.Fr. collecter, from L. collectus, p.p. of colligere “gather together,” from → com- “together” + legere “to gather,” cf. L. lignum “wood, firewood,” lit. “that which is gathered”;
cognate with Gk. legein “to say, tell, declare,” from PIE *leg- “to pick together, gather, collect”

Etymology (PE): 1) Gerdâvardan “to collect,” from gerd “round; around,” → disk; alternatively, ultimately from PIE base *ger- “to gather,” cf. Iranian ger-, gor-, etc. “to gather,”
→ category, + âvardan “to bring,” → production.
Anbâštan, anbârdan “to fill, to replete;” Mid.Pers. hambāridan “to fill;” from Proto-Iranian *ham-par-, from prefix ham-, → com-, + par- “to fill;” cf. Av. par- “to fill,” parav-, pauru-, pouru- “full, much, many;” O.Pers. paru- “much, many;” Mid.Pers. purr “full;” Mod.Pers. por “full, much, very;” PIE base *pelu- “full,” from *pel- “to be full;” cf. Skt. puru- “much, abundant;” Gk. polus “many,” plethos “great number, multitude;” O.E. full.

2. Gerdâmadan “to come together,” with âmadan “to come,” → efficiency.