Answer: leap

AnswerCrossword Clue
LEAP.. of faith
LEAPSteve Martin film, ".. of Faith"
LEAPThe Great ... Forward
LEAPSudden transition
LEAPVerb in the old "Superman" intro
LEAPUnwarranted conclusion, figuratively
LEAPLogician's error, maybe
LEAP"... one giant ... for mankind"
LEAPLeave one's feet
LEAPQuantum event?
LEAPGet off the ground
LEAPBound
LEAP"...one giant .. for mankind"
LEAPIt may be quantum
LEAPGo for a rebound
LEAPLook before you ..
LEAPMomentary abandonment of logic
LEAPVault
LEAPQuantum ..
LEAPHurdle (over)
leapaction of which the consequences are unknown
LEAP... in the dark (chancy act)
LEAPJete, for one
LEAPJump
LEAP"Quantum ..."
LEAPIt's a big one for mankind
LEAPLovers' venue
LEAPAct of faith?
LEAPStart of a bungee jump
LEAPSudden increase
LEAPTake a giant step
LEAPBound upward
LEAPMake the ... (become great, as a promising athlete)
LEAPIllogical step
LEAPAbrupt transition
LEAPHurdle
LEAPJete
LEAPAcknowledge 2-29?
LEAPEntrechat, e.g.
LEAPSpring