opening, inauguration, Disclosure, divulgation, divulgement, divulgence

commencement, opening

cavity, aperture, opening, sinus, absconsio, centesis

opening, vent, aperture, pore, aditus, apertura

initial, preparatory, opening, rudimentary, preparative, pilot

opening, inchoate, inchoative, unbegun, lead-off

elementary, first, seminal, primitive, primal, opening

inchoative, inchoate, exordial, prelusive, opening, ingoing

start, commencement, beginning, outset, opening, seed

beginning, outset, commencement, opening, dawn, springhead

hole, aperture, pore, slit, opening, bore

mouth, face, maw, orifice, opening, porthole

mouth, face, facade, front, kisser, opening

blooming, eruption, opening, manifestation

facade, vanguard, chessman, opening, muzzle, advance guard

porthole, perforation, hole, opening, ventage, vent

eyelet, hole, orifice, opening, bore