The Collaborative International Dictionary of English v.0.48:
Promptness \Prompt"ness\, n. [1913 Webster] 1. Promptitude; readiness; quickness of decision or action. [1913 Webster] 2. Cheerful willingness; alacrity. [1913 Webster]WordNet (r) 3.0 (2006):
promptness n 1: the characteristic of doing things without delay [syn: promptness, promptitude] 2: the quality or habit of adhering to an appointed time [syn: punctuality, promptness] [ant: tardiness]