Photosynthesis is an integral process in the carbon cycle, as it converts atmospheric carbon dioxide into organic compounds.
光合作用是碳循环中不可或缺的过程，因为它将大气中的二氧化碳转化为有机化合物。
Which choice best defines “integral”?
A — Essential or necessary for completeness. “integral” means essential or necessary for completeness.
Which word means “essential or necessary for completeness”?
C — integral. “integral” means essential or necessary for completeness.
integral — essential or necessary for completeness. In Chinese: 整体的，完整的.
integral is pronounced /ˈɪntɪɡrəl/.
Photosynthesis is an integral process in the carbon cycle, as it converts atmospheric carbon dioxide into organic compounds. (光合作用是碳循环中不可或缺的过程，因为它将大气中的二氧化碳转化为有机化合物。)
essential, fundamental, indispensable — all close in meaning to integral (essential or necessary for completeness).
peripheral, dispensable — each the opposite of integral (essential or necessary for completeness).
Yes. integral is on the SAT Prep Easy list — mid-frequency academic words that do get tested. The Digital SAT does not test vocabulary in isolation; words like this one are tested through Words in Context questions, where you choose the word that completes a passage most logically and precisely.
in(Not)+teg(Touch)+ral(adjective suffix)→ untouchable → integral, whole.