A, acerbity, acidity, acidulousness, acme, acridity, acrimony, acuity, aculeate, acuminate, acumination, acuteness, adjoin, advantage, air line, allowance, alpha, anxious, apex, apogee, apprehensive, asperity, astringency, axis, bank, barb, beeline, befringe, beginning, bind, bite, bitingness, bitterness, blast-off, board, border, bordure, bound, boundary, bourn, brim, brink, brow, bulge, cap, causticity, chord, climax, cloud nine, coast, coign of vantage, commencement, crabbed, crawl, creation, creep, crest, crown, culmen, culmination, cuspidate, cut, cutting edge, cuttingness, dawn, deadwood, diagonal, diameter, direct line, directrix, draw, drop, edge tool, edgy, effectiveness, end, enframe, establishment, extreme limit, extremity, featheredge, fidgety, fierceness, file, flange, flank, flying start, force, foundation, frame, fresh start, fringe, go crabwise, go sideways, great-circle course, grind, grip, handicap, harshness, head start, heaven, heavens, height, hem, high noon, highest pitch, highest point, hone, ill at ease, inch, incisiveness, inside track, institution, irascible, irritable, jump, jump-off, keenness, kick-off, knife-edge, labellum, labium, labrum, lap, lateral, lateralize, lead, leading edge, ledge, limb, limbus, limit, line, lip, list, make leeway, march, marge, margin, marginate, maximum, meridian, mordacity, mordancy, mountaintop, move, mucronation, ne plus ultra, nervous, new departure, no place higher, noon, normal, odds, oilstone, on edge, on tenterhooks, oncoming, onset, opening, origin, origination, outbreak, outline, outset, peak, peevish, penetration, perimeter, periphery, perpendicular, pinnacle, piquancy, pitch, poignancy, point, pointedness, pole, prickliness, prickly, pungency, purfle, purl, radius, radius vector, ragged edge, razor-edge, reset, restive, restless, ridge, right line, rigor, rim, roughness, running start, secant, segment, selvage, send-off, sensitive, set, set off, setting in motion, setting-up, seventh heaven, severity, sharp, sharpen, sharpness, shore, shortcut, shrillness, side, sideline, sideslip, sidestep, sidle, skew, skid, skirt, sky, something extra, something in reserve, sourness, spiculate, spinosity, spire, spur, square one, start, start-off, starting point, steal, sting, straight, straight course, straight line, straight stretch, straightaway, strap, streamline, stridency, stringency, strop, summit, superiority, surround, take-off, tangent, taper, tartness, teeth, tense