(PLS, WAIS, Fulcrum)
Proximity (within N words) or adjacency of two keywords. Example: ADJ ( Chernov, bounds ) searches for keywords ``Chernov'' and ``bounds'' when they are adjacent. ADJ ( Chernov, bounds, 1 ) searches for keywords ``Chernov'' and ``bounds'' when they are adjacent or separated by 1 word, including ``Chernov like bounds''.