zeal
definition
great energy or enthusiasm in pursuit of a cause or an objective
example
Her zeal for environmental conservation inspired the whole community to participate in the project.
synonyms
enthusiasmfervorpassion
word origin — The word 'zeal' originates from the Latin 'zelus' meaning 'jealousy, zeal', which in turn comes from the Greek 'zēlos' meaning 'emulation, jealousy'.