Accurate measurement of temperature is necessary for determining the rate of a chemical reaction.
准确测量温度对于确定化学反应速率是必要的。
Historian Thomas Reyes agrees that the printing press mattered but argues that widespread literacy programs, which predated the press by decades in some regions, were an equally necessary precondition, since a printed pamphlet is useless to someone who cannot read it.
From a Cross-Text Connections question · Craft and Structure
Historian Ian Farrow agrees that the mechanical clock mattered but argues that the expansion of railway networks, which required synchronized timekeeping across distant towns, was an equally necessary precondition for the widespread adoption of standardized time.
From a Cross-Text Connections question · Craft and Structure
Historian Samuel Okonkwo agrees that coffeehouses mattered but argues that rising literacy rates, which allowed patrons to read and discuss newspapers distributed at those very coffeehouses, were an equally necessary precondition for the debates Ferretti describes.
From a Cross-Text Connections question · Craft and Structure
Which choice best defines “necessary”?
C — Needed to be done, achieved, or present; essential. “necessary” means needed to be done, achieved, or present; essential.
Which word means “needed to be done, achieved, or present; essential”?
B — necessary. “necessary” means needed to be done, achieved, or present; essential.
necessary — needed to be done, achieved, or present; essential. In Chinese: 必要的.
necessary is pronounced /ˈnɛsəˌsɛri/.
Accurate measurement of temperature is necessary for determining the rate of a chemical reaction. (准确测量温度对于确定化学反应速率是必要的。)
essential, required, indispensable — all close in meaning to necessary (needed to be done, achieved, or present; essential).
optional, unnecessary — each the opposite of necessary (needed to be done, achieved, or present; essential).
Yes. necessary is on the SAT Prep Basic list — the everyday academic words the SAT assumes you already have. 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.