Main entry: posterior, ulterior, later
Definition: coming at a subsequent time or stage
Usage: without ulterior argument; the mood posterior to
Main entry: ulterior
Definition: beyond or outside an area of immediate interest; remote
Usage: a suggestion ulterior to the present discussion; without...any purpose, immediate or ulterior- G.B.Shaw
Main entry: ulterior, subterranean, subterraneous
Definition: lying beyond what is openly revealed or avowed (especially being kept in the background or deliberately concealed)
Usage: subterranean motives for murder; looked too closely for an ulterior purpose in all knowledge- Bertrand Russell