Wiktionary
prep.phr. prior to the expected time; early.
WordNet
Wikipedia
Ahead of Time is a collection of science fiction stories by Henry Kuttner, first published in hardcover by Ballantine Books in 1953 (with a paperback edition shortly afterwards). A British hardcover appeared in 1954, with a paperback following in 1961. Paperback reissues of both the UK and US editions appeared in the mid-1960s. A French translation appeared in 1962, and an Italian translation in 1971.
Ahead of Time is a 2004 Icelandic musical comedy film directed by Ágúst Guðmundsson. It is about the comeback of the band Stuðmenn, known from Ágúst Guðmundsson's 1982 film On Top.
Usage examples of "ahead of time".
These had to know that Birgitte had departed in a hurry, and now she returned with Elayne, ahead of time.
Arymilla and the others stayed together, moving from camp to camp according to no pattern she could see, and for some time great effort had gone into trying to learn where they would be ahead of time.
Whatever was coming might lie days in the future or only an hour, but he had never been able to figure it out ahead of time.
We're the ones who're supposed to provide intelligence ahead of time, and we didn't do it.
The password phrases were culled out of Other Side popular culture, guaranteeing that Karl, Walter, or Ahira could answer a challenge without having been given the response ahead of time.
The general was perfectly capable of planning ahead of time to bring enough hats with him that he could stomp a dozen of them into oblivion and still appear the next day, as fancily dressed as ever.
I fret about things ahead of time so they don't sneak up on me when the moment comes.