Equality of extension or duration.

Roget 27: equality, parity, coextension^†, symmetry, balance, poise; evenness, monotony, level.    equivalence; equipollence^†, equipoise, equilibrium, equiponderance^†; par, quits, a wash; not a pin to choose; distinction without a difference, six of one and half a dozen of the other; tweedle dee and tweedle dum [Lat.]; identity etc. 13; similarity etc. 17.    equalization, equation; equilibration, co-ordination, adjustment, readjustment.    drawn game, drawn battle; neck and neck race; tie, draw, standoff, dead heat.    match, peer, compeer, equal, mate, fellow, brother; equivalent.    ... show more

Roget 216: parallelism; coextension^†; equidistance^†; similarity etc. 17.