reasoning — a basis or cause, as for some belief, action, fact, event, etc.: the reason for declaring war.
seasoning — one of the four periods of the year (spring, summer, autumn, and winter), beginning astronomically at an equinox or solstice, but geographically at different dates in different climates.
sequencing — the following of one thing after another; succession.
sweetening — something that sweetens food, beverages, etc., as sugar, saccharine, etc.