Engineers proposed to lengthen the runway to accommodate larger aircraft, a project that would take two years to complete.
工程师提议延长跑道以容纳更大的飞机，这一项目将耗时两年完成。
Which choice best defines “lengthen”?
B — To make longer. “lengthen” means to make longer.
Which word means “to make longer”?
A — lengthen. “lengthen” means to make longer.
lengthen — to make longer. In Chinese: 延长.
lengthen is pronounced /ˈleŋθən/.
Engineers proposed to lengthen the runway to accommodate larger aircraft, a project that would take two years to complete. (工程师提议延长跑道以容纳更大的飞机，这一项目将耗时两年完成。)
extend, prolong, stretch — all close in meaning to lengthen (to make longer).
shorten, abbreviate — each the opposite of lengthen (to make longer).
Yes. lengthen 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.