noun
great achievement; great feat; great work
Refers to a remarkable accomplishment, often in fields like science, sports, or history. Carries a formal, respectful tone.
彼のノーベル賞受賞は科学界の偉業だ。
His Nobel Prize win is a great achievement in the scientific world.
この橋の建設は当時としては偉業だった
The construction of this bridge was a great feat at the time.
Compound of 偉 (great, admirable) and 業 (work, deed). The kanji combination directly conveys 'great work'.