An Etymological Dictionary of Astronomy and Astrophysics

1. Math.: Independent extension in a given direction; a property of space.
   

2. Physics: → physical dimension.

Etymology (EN): From L. dimensionem (nom. dimensio), from stem of dimetri “to measure out,” from → dis- + metri “to measure.”

Etymology (PE): Vâmun, from vâ-, → dis-, + mun,
variant mân “measure” (as in Pers. terms pirâmun “perimeter,” âzmun “test, trial,”
peymân “measuring, agreement,” peymâné “a measure; a cup, bowl”), from O.Pers./Av. mā(y)- “to measure;” PIE base *me- “to measure;” cf. Skt. mati “measures,” matra- “measure;” Gk. metron “measure;” L. metrum.