1 opening, space, aperture, distance, hole, void, gulf, cavity, break, breach, crevice, chink, crack, split, division, cleft, rift, rip, tear, rent; interruption, interval, lacuna, hiatus, discontinuity, disruption; lull, pause, rest, recess, halt, stop, suspension, delay, wait, intermission, respite:
The gap between the walls is just big enough for a child. I can see through a gap in the curtain. There is a gap in his payment record.
2 difference, divergence, disparity, disagreement, inconsistency, discrepancy; division, distinction:
A gap exists between your ideas of justice and mine.