GAP

I. noun Etymology: Middle English, from Old Norse, chasm, hole; akin to Old Norse ~a to ~e Date: 14th century 1. a break in a barrier (as a wall, hedge, or line of military defense), an assailable position, 2. a mountain pass, ravine , spark ~ , 4. a separation in space, an incomplete or deficient area , a break in continuity ; hiatus , a break in the vascular cylinder of a plant where a vascular trace departs from the central cylinder, lack of balance ; disparity , a wide difference in character or attitude , a problem caused by some disparity , ~py adjective II. verb (~ped; ~ping) Date: 1879 transitive verb to make an opening in, to adjust the space between the electrodes of (a spark plug), intransitive verb to fall or stand open