TBESG:ἄνοιξιςopeningG:N-F ἄνοιξις, -εως, ἡ (< ἀνοίγω), an opening (in MGr., springtime): ἐν ἀ., as often as I open, Eph.6:19.† (AS)
ἀνοίγω anoigō an-oy'-go From G303 and οἴγω oigō (to open); to open up (literally or figuratively, in various applications)KJV Usage: open.
διανοίγω dianoigō dee-an-oy'-go From G1223 and G455; to open thoroughly, literally (as a first born) or figuratively (to expound)KJV Usage: open.