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RELATED WORDS : by the hour canonical hour credit hour early-morning hour eleventh eleventh cranial nerve happy hour hour hour angle hour circle hour hand kilometers per hour kilometres per hour kilowatt hour late-night hour light hour man hour miles per hour person hour rush hour semester hour sidereal hour twenty-four hour period witching hour zero hour

WORDNET DICTIONARY

Noun eleventh hour has 1 sense

• eleventh hour(n = noun.time) last minute - the latest possible moment; "money became available at the eleventh hour"; "at the last minute the government changed the rules"
is a kind of instant, minute, moment, second

THESAURUS

eleventh hour

A-day, D day, H hour, bedtime, belatedness, charged moment, critical moment, crucial moment, curfew, deadline, deathbed, decisive moment, high time, kairos, kairotic moment, last minute, last-minute, late hour, lateness, later, moment of truth, nick of time, pregnant moment, psychological moment, small hours, tardiness, target date, unpreparedness, unpunctuality, unreadiness, untimeliness, zero hour

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eleventh hour

Evening

N evening, eve, decline of day, fall of day, close of day, candlelight, candlelighting, eventide, nightfall, curfew, dusk, twilight, eleventh hour, sunset, sundown, going down of the sun, cock-shut, dewy eve, gloaming, bedtime, afternoon, postmeridian, p, m, autumn, fall, fall of the leaf, autumnal equinox, Indian summer, St. Luke's summer, St. Martin's summer, midnight, dead of night, witching hour, witching hour of night, witching time of night, winter, killing time, vespertine, autumnal, nocturnal, midnight, the outpost of advancing day, sable-vested Night, this gorgeous arch with golden worlds inlay'd.

For further exploring for "eleventh hour" in Webster Dictionary Online