18 synonyms of duration from the Merriam-Webster Thesaurus, plus 21 related words, definitions, and antonyms. duration synonyms, duration pronunciation, duration translation, English dictionary definition of duration. How to use long-standing in a sentence. Having existed or persisted for a long time: a longtime friend; a longtime resident of Detroit. Duration: the period during which something exists, lasts, or is in progress. Find more ways to say long-time, along with related words, antonyms and example phrases at Thesaurus.com, the world's most trusted free thesaurus. Another way to say Go On For A Long Time? Time to maturity. See more. Synonyms for length of time in English including definitions, and related words. n. 1. longtime synonyms, longtime pronunciation, longtime translation, English dictionary definition of longtime. See more. Long-term definition is - occurring over or involving a relatively long period of time. Long-lived: … How to use long-term in a sentence. Synonyms for Go On For A Long Time (other words and phrases for Go On For A Long Time). The definition of long is an extended distance or an extended period of time. Long-standing definition is - of long duration. A period of existence or persistence: sat quietly through the duration of the speech. adj. See more. Duration definition, the length of time something continues or exists (often used with the). ... till the cows come home For a long time, forever. Continuance or persistence in time. 19 synonyms of long-lived from the Merriam-Webster Thesaurus, plus 37 related words, definitions, and antonyms. Define longtime. 2. Find another word for duration. Find another word for long-lived. Longtime definition, existing, occurring, or continuing for a long period of time; longstanding: longtime friends celebrating 50 years of association. What does long mean? Another word for long-time. Define duration. Long-lasting definition, enduring or existing for a long period of time: a long-lasting friendship. The longer the maturity, the higher the duration, and the greater the interest rate risk.Consider two bonds that each yield 5% and cost $1,000, but have different maturities.