free from imperfection: PERFECT. free or relatively free from mixture: PURE. OUTRIGHT, UNMITIGATED. being, governed by, or characteristic of a ruler or authority completely free from constitutional or other restraint. having no restriction, exception, or qualification. POSITIVE, UNQUESTIONABLE. independent of arbitrary standards of measurement. relating to or derived in the simplest manner from the fundamental units of length, mass, and time. relating to, measured on, or being a temperature scale based on absolute zero. FUNDAMENTAL, ULTIMATE. perfectly embodying the nature of a thing. standing apart from a normal or usual syntactical relation with other words or sentence elements. standing alone without a modified substantive. having no object in the particular construction under consideration though normally transitive. being self-sufficient and free of external references or relationships. being the true distance from an aircraft to the earth's surface.