endeavor
n. countable B2 Upper Intermediate US //ɪnˈdɛvɝ// en·deav·or
n. a serious attempt to achieve something. You use this word when you want to sound formal about a goal or project.
n. a serious attempt to achieve a specific result or goal. Formal in register; often used in the plural form 'endeavors'.
Learning a new language is a big endeavor.
The team viewed the software update as a major endeavor requiring months of work.
The restoration of the historic library was a monumental endeavor, demanding both significant funding and meticulous attention to architectural detail.