"economical in use," 1590s, from Middle French frugal, from Latin frugalis, from undeclined adjective frugi "useful, proper, worthy, honest; temperate, economical," originally dative of frux (plural fruges) "fruit, produce," figuratively "value, result, success," from PIE root *bhrug- "to enjoy," with derivatives referring to agricultural products. Sense evolved in Latin from "useful" to "profitable" to "economical." Related: Frugally.
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