1. [adj]  (usually followed by `to' or `for') on the point of or strongly disposed; "in no fit state to continue"; "fit to drop"; "laughing fit to burst"; "she was fit to scream"; "primed for a fight"; "we are set to go at any time"
2. [adj]  being below the horizon; "the moon is set"

SET(P) is a 6 letter word that starts with S.