eleventh-hour adjective 1eleventh hour noun 1forms 1 adjective1 •Just before the moment that it is too late; in the nick of time; last-minute.Eleventh-hour executive changes are not unique to this outgoing Administration — President Bill Clinton launched a number himself before leaving office. — 2008 eleventh hour noun1 •A point in time which is nearly too late; the last minute.If she repented, though at the eleventh hour, it was not too late. — 1857 formseleventh hours