An Etymological Dictionary of Astronomy and Astrophysics

Belonging to or shared by two or more or all in question. → common denominator, → least common multiplier.

Etymology (EN): From M.E. comun, from O.Fr. comun, from L. communis “in common, public, general, shared by all or many,” originally “sharing common duties,” akin to munia “duties, public duties, functions,” from
munus “task, duty, gift.”

Etymology (PE): Hamdâr, literally “possessing together, sharing together,” from ham-,
→ com-, + dâr present stem of dâštan “to have, to possess,” from Mid.Pers. dâštan, O.Pers./Av. root dar- “to hold, keep back, maitain, keep in mind,” Skt. dhr-, dharma- “law,”
Gk. thronos “elevated seat, throne,” L. firmus “firm, stable,” Lith. daryti “to make,” PIE *dher- “to hold, support.”