agency, ancestor, ancestors, announcer, antecede, antecedents, antedate, anterior, anticipatory, ascendant, ascendants, avant-garde, base, basis, bellwether, buccinator, bushwhacker, call, causation, cause, cause and effect, chief, ci-devant, determinant, determinative, earlier, early, elder, elders, element, etiology, exordial, explorer, factor, fathers, first, fore, forebear, forebears, forefather, forefathers, foregoer, foregoing, foremost, forerun, forerunner, former, front runner, frontiersman, fugleman, grandfathers, grandparents, ground, groundbreaker, grounds, guide, harbinger, heading, headmost, herald, inaugural, initiatory, innovator, instrumentality, lead runner, leader, leading, means, messenger, occasion, older, pace, past, pathfinder, patriarchs, pioneer, point, precedent, preceding, precessional, precurrent, precursor, precursory, predate, predecessor, predecessors, preexistent, prefatory, preliminary, preludial, prelusive, premise, preparatory, prevenient, previous, prime, primogenitor, principle, prior, proemial, progenitor, progenitors, propaedeutic, prototype, reason, scout, senior, stimulus, stormy petrel, trailblazer, trailbreaker, vanguard, vaunt-courier, voortrekker