Time without end is a term used to describe something that is infinite and everlasting. The crossword solutions for this term are EON (3 letters), AEONS (5 letters), PERPETUITY (10 letters), ETERNITY (8 letters), and AEON (4 letters). EON is the shortest of these terms, referring to an indefinitely long period of time. Aeons is a plural form of EON, referring to multiple eons. PERPETUITY is a term meaning forever or ETERNITY, and ETERNITY is another word for an infinite amount of time. Finally, AEON is another word for an indefinite period of time, similar to EON.