Letter: a
- axial, ascending, back, back-flowing, backward, central, centralized, centric, concentrated, descending, down-trending, downward, drifting, flowing, fluent, flying
- axiology, Ten Commandments, aesthetics, casuistry, code, cosmology, epistemology, ethics, ethos, logic, metaphysics, moral climate, moral code, morals, norm, ontology
- axiom, a belief, a priori principle, a priori truth, absolute fact, accepted fact, actual fact, adage, admitted fact, affirmation, analects, aphorism, article of faith, assertion, assumed position, assumption
- axiomatic, absolute, actual, admitting no question, aphoristic, apparent, clear, clear as crystal, crisp, crystal-clear, demonstrable, discernible, distinct, epigrammatic, evident, explicit
- axis, air line, alliance, arbour, assemblage, association, axle, axle bar, axle shaft, axle spindle, axle-tree, band, bearing, beeline, bloc, body
- axle bar, arbour, axis, fulcrum, gudgeon, hinge, hub, nave, pin, pivot, pole, radiant, spindle, swivel
- axle shaft, arbour, axis, fulcrum, gudgeon, hinge, hub, nave, pin, pivot, pole, radiant, spindle, swivel
- axle spindle, arbour, axis, fulcrum, gudgeon, hinge, hub, nave, pin, pivot, pole, radiant, spindle, swivel
- axle, arbour, axis, fulcrum, gudgeon, hinge, hub, nave, pin, pivot, pole, radiant, spindle, swivel
- axle-tree, arbour, axis, fulcrum, gudgeon, hinge, hub, nave, pin, pivot, pole, radiant, spindle, swivel
- axon, brain, cerebral cortex, ganglion, grey matter, nerve, nervous system, neuron, plexus, solar plexus, spinal cord, synapse
- ayah, au pair girl, biddy, chambermaid, chaperon, companion, cook, dry nurse, duenna, gentlewoman, girl, handmaid, maid, mammy, nanny, nurse
- aye, OK, acceptance, accord, acquiescence, affirmation, affirmative, affirmative attitude, affirmative voice, agreed, agreement, amen, approbation, approval, assent, ballot
- aye-aye, ape, gorilla, man, primate
- azimuth circle, bevel, normal, perpendicular, plumb, protractor, quadrant, sextant, transit, upright, vertical
- azimuth compass, bevel, protractor, quadrant, sextant, transit
- azimuth, abscissa, aim, altitude, aspect, attitude, bearing, bearings, bent, celestial navigation, compass direction, coordinates, course, current, cylindrical coordinates, dead reckoning
- azimuthal equidistant projection, atlas, cartography, chart, globe, index, latitude, legend, longitude, map, map maker, meridian, parallel, projection, road map, scale
- azimuthal projection, atlas, cartography, chart, globe, index, latitude, legend, longitude, map, map maker, meridian, parallel, projection, road map, scale
- azure, achievement, air, animal charge, argent, armorial bearings, armoury, arms, azure-blue, azure-coloured, bandeau, bar, bar sinister, baton, bearings, bend
- azure-blue, azure, blue, cerulean, livid, sapphire, sky blue
- azure-coloured, azure, blue, cerulean, livid, sapphire, sky blue
