The theory's initial supposition that the planet had a solid core was later confirmed by seismic measurements.
该理论最初的假设，即行星有固态核心，后来被地震测量所证实。
Which choice best defines “supposition”?
D — An idea or theory that you believe is true even though you do not have proof. “supposition” means an idea or theory that you believe is true even though you do not have proof.
Which word means “an idea or theory that you believe is true even though you do not have proof”?
A — supposition. “supposition” means an idea or theory that you believe is true even though you do not have proof.
supposition — an idea or theory that you believe is true even though you do not have proof. In Chinese: 假设.
supposition is pronounced /ˌsʌpəˈzɪʃn/.
The theory's initial supposition that the planet had a solid core was later confirmed by seismic measurements. (该理论最初的假设，即行星有固态核心，后来被地震测量所证实。)
hypothesis, assumption, conjecture — all close in meaning to supposition (an idea or theory that you believe is true even though you do not have proof).
fact, certainty — each the opposite of supposition (an idea or theory that you believe is true even though you do not have proof).
Yes. supposition 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.