Noun

• S: (n) eon, aeon (the longest division of geological time)
• S: (n) eon, aeon (an immeasurably long period of time) "oh, that happened eons ago"
• direct hypernym / inherited hypernym / sister term
• S: (n) long time, age, years (a prolonged period of time) "we've known each other for ages"; "I haven't been there for years and years"
• S: (n) month of Sundays (a time perceived as long) "I hadn't seen him in a month of Sundays"
• S: (n) eon, aeon (an immeasurably long period of time) "oh, that happened eons ago"
• direct hypernym / inherited hypernym / sister term
• S: (n) long time, age, years (a prolonged period of time) "we've known each other for ages"; "I haven't been there for years and years"
• S: (n) time period, period of time, period (an amount of time) "a time period of 30 years"; "hastened the period of time of his recovery"; "Picasso's blue period"
• S: (n) fundamental quantity, fundamental measure (one of the four quantities that are the basis of systems of measurement)
• S: (n) measure, quantity, amount (how much there is or how many there are of something that you can quantify)
• S: (n) abstraction, abstract entity (a general concept formed by extracting common features from specific examples)
• S: (n) entity (that which is perceived or known or inferred to have its own distinct existence (living or nonliving))
• derivationally related form
• W: (adj) eonian [Related to: eon] (continuing forever or indefinitely) "the ageless themes of love and revenge"; "eternal truths"; "life everlasting"; "hell's perpetual fires"; "the unending bliss of heaven"
• S: (n) blue moon (a long time) "something that happens once in blue moon almost never happens"
• S: (n) year dot (as long ago as anyone can remember) "he has been a conductor since the year dot"
• derivationally related form
• S: (n) eon, aeon ((Gnosticism) a divine power or nature emanating from the Supreme Being and playing various roles in the operation of the universe)