Cases of word usage

1) in, to, a position at or further back (behind)

2) an electronic device which stores information (data), analyses it and produces further information as required (computer)

3) (to cause something) to become wider, larger, further open (dilate)

4) (of chess) a position of the pieces from which no further move is possible; any stage of a dispute at which further action by either side seem to be impossible (stalemate)

5) (used in questions) which person or group; (used to show which person or group is being referred to); (used to add further information) (who)