Strong's 2205 (ζῆλος)

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emulation, envy(-ing), fervent mind, indignation, jealousy, zeal

properly, heat, i.e. (figuratively) "zeal" (in a favorable sense, ardor; in an unfavorable one, jealousy, as of a husband (figuratively, of God), or an enemy, malice)

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from G2204 (ζέω);