| Kenneth G. Wilson (1923). The Columbia Guide to Standard American English. 1993. |
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| dirigible (adj., n.) |
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| Both parts of speech have two pronunciations in divided usage, DIR-ij-i-bul and di-RIJ-i-bul. The adjective has long meant steerable, and the noun is a clipped form of the phrase dirigible balloon, a steerable balloon. | 1 |
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| | | The Columbia Guide to Standard American English. Copyright © 1993 Columbia University Press. |
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