1560s, from French équidistant (14c.), from Late Latin aequidistantem (nominative aequidistans), from aequi- (see equal (adj.)) + distans (see distant). In reference to a type of map projection, from 1866. Related: Equidistance.
late 14c., "identical in amount, extent, or portion;" early 15c., "even or smooth of surface," from Latin aequalis "uniform, identical, equal," from aequus "level, even, flat; as tall as, on a level with; friendly, kind, just, fair, equitable, impartial; proportionate; calm, tranquil," which is of unknown origin. Parallel formation egal (from Old French egal) was in use late 14c.-17c. Equal rights is from 1752; by 1854 in American English in reference to men and women. Equal opportunity (adj.) in terms of hiring, etc. is recorded by 1925.
late 14c., "standing or being apart from a given point or place," from Old French distant (14c.), from Latin distantem (nominative distans), present participle of distare "to stand apart, be remote," from dis- "apart, off" (see dis-) + stare "to stand," from PIE root *sta- "to stand, make or be firm."
Sense of "separated by an unspecified but large space" is from early 15c.; meaning "remote or far off in time" is from c. 1600. Sense of "not cordial or familiar" is by 1709. Related: Distantly.
<a href="https://www.etymonline.com/word/equidistant">Etymology of equidistant by etymonline</a>
Harper, D. (n.d.). Etymology of equidistant. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/equidistant