THESAURUS
headmost
acmatic, ahead, antecedent, anterior, apical, arch, banner, before, capital, cardinal, central, champion, chief, consummate, crowning, dominant, exordial, first, focal, fore, foregoing, forehand, foremost, forward, front, frontal, great, head, heading, hegemonic, highest, in advance, in front, in the forefront, in the foreground, in the front, in the lead, inaugural, initiatory, leading, magisterial, main, master, maximal, maximum, meridian, meridional, overmost, overruling, paramount, precedent, preceding, precessional, precursory, predominant, preeminent, prefatory, preliminary, preludial, prelusive, preparatory, preponderant, prevailing, prevenient, primal, primary, prime, principal, prior, proemial, propaedeutic, ranking, ruling, sovereign, star, stellar, summital, supereminent, supreme, tip-top, to the fore, to the front, top, topflight, topmost, ultimate, up ahead, upmost, uppermost, vertical, zenithal
ROGET THESAURUS
headmost
Precession
N
precession, leading, heading, precedence, priority, the lead, le pas, van, precursor, leading, precedent, in advance, before, ahead, in the van, in the lead, foremost,
headmost, in front, at the head, out in front, way out in front, far ahead, seniores priores, ahead of his time.