high time noun 2high-time adjective 1forms 3 noun2 •A point in time at which something is considered to be utterly due or even overdue to occur; well past time."But it is high time for me to have done with the argument, as it is to be judged of according to scripture evidence." — 1729 •A very enjoyable or exciting experience or period of time.[T]here's going to be a high time in the Blue City tonight. We'll have music and dancing and eating. — 1912 high-time adjective1 •Having been in use for a (relatively) long time or a large number of operating cycles; nearing retirement or replacement age. formshigh times · higher-time · highest-time