The temperature in the desert dropped extremely quickly after sunset, surprising the overnight campers.
日落之后，沙漠中的温度下降得极其迅速，令露营者感到惊讶。
Because lichens grow extremely slowly and absorb minerals directly from the air and rain, scientists use their size to estimate how long a rock surface has been exposed, a technique called lichenometry.
From a Central Ideas and Details question · Information and Ideas
Bristlecone pines, found in the high-altitude mountains of the western United States, grow extremely slowly in harsh, nutrient-poor conditions; remarkably, this slow growth, combined with wood so dense it resists insects and fungal decay, allows some individual trees to survive for over 4,000 years.
From a Central Ideas and Details question · Information and Ideas
- Webb orbits much farther from Earth than Hubble does, to keep its instruments extremely cold.
From a Rhetorical Synthesis question · Expression of Ideas
Which choice best defines “extremely”?
D — To a very great degree. “extremely” means to a very great degree.
Which word means “to a very great degree”?
A — extremely. “extremely” means to a very great degree.
extremely — to a very great degree. In Chinese: 极其，非常.
extremely is pronounced /ɪkˈstrimli/.
The temperature in the desert dropped extremely quickly after sunset, surprising the overnight campers. (日落之后，沙漠中的温度下降得极其迅速，令露营者感到惊讶。)
exceedingly, immensely, profoundly — all close in meaning to extremely (to a very great degree).
slightly, moderately — each the opposite of extremely (to a very great degree).
Yes. extremely 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.