(n.) The state or quality of being horizontal.

abnegation abstinence accordance balance bilateral symmetry calm calmness clockwork regularity coequality coextension conformity congruity conservatism consistency consonance constancy constraint continence continuity control cool correspondence dispassion downiness dynamic symmetry equability equality equanimity equation equilibrium equipoise equipollence equiponderance equity equivalence equivalency eurythmics eurythmy finish flatness flushness frictionlessness gentleness glabriety glabrousness glossiness golden mean greasiness happy medium harmony homogeneity horizontalism horizontality horizontalness identity impartiality judiciousness juste-milieu justice keeping lenity levelness likeness lubricity meden agan methodicalness middle way mildness moderateness moderation moderationism monolithism multilateral symmetry neutrality nonviolence nothing in excess oiliness pacifism par parallelism parity persistence planeness poise polarity proportion proportionality prudence punctuality regularity repetition repose restraint satininess self-abnegation self-control self-denial self-restraint serenity shapeliness silkiness sleekness slickness slipperiness smoothness sobriety stability steadfastness steadiness suavity symmetricalness symmetry systematicalness temperance temperateness tranquillity trilateral symmetry unexcessiveness unextravagance unextremeness uniformity unity unruffledness velvetiness via media