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tenacity (n.)

early 15c., tenacite, "quality of holding firmly," from Old French ténacité (14c.) and directly from Latin tenacitas "an act of holding fast," from tenax (genitive tenacis) "holding fast, gripping, clingy; firm, steadfast," from tenere "to hold," from PIE root *ten- "to stretch."

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Definitions of tenacity from WordNet

tenacity (n.)
persistent determination;
Synonyms: doggedness / perseverance / persistence / persistency / tenaciousness / pertinacity
From wordnet.princeton.edu