slot

1a :  a narrow opening or groove :  slit, notch a mail slot in a doorb :  a narrow passage or enclosurec :  a passage through the wing of an airplane or of a missile that is located usually near the leading edge and formed between a main and an auxiliary airfoil for improving flow conditions over the wing so as to increase lift and delay stalling of the wingd :  the area on a hockey rink in front of the crease and between the face-off circles

2 :  a place or position in an organization, arrangement, or sequence :  niche, spot

3 :  slot machine 2 —usually used in plural

4 :  a gap between an end and a tackle in an offensive football line