Etymology
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long-term (adj.)

also longterm, 1876, originally in insurance underwriting, from long (adj.) + term (n.).

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Definitions of long-term

long-term (adj.)
relating to or extending over a relatively long time;
a long-term investment
the long-term reconstruction of countries damaged by the war
Synonyms: long-run / semipermanent
From wordnet.princeton.edu