| incendiarism | (noun) malicious burning to destroy property | Synonyms: arson, fire-raising |
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| incendiary | (noun) a bomb that is designed to start fires; is most effective against flammable targets (such as fuel) | Synonyms: firebomb, incendiary bomb |
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| (noun) a criminal who illegally sets fire to property | Synonyms: arsonist, firebug |
| incense | (noun) the pleasing scent produced when incense is burned | - |
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| (noun) a substance that produces a fragrant odor when burned | - |
| incentive | (noun) a positive motivational influence | Synonyms: inducement, motivator |
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| (noun) an additional payment (or other remuneration) to employees as a means of increasing output | Synonyms: bonus |
| inception | (noun) an event that is a beginning; a first part or stage of subsequent events | Synonyms: origin, origination |
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| incertitude | (noun) the state of being unsure of something | Synonyms: doubt, doubtfulness, dubiety, dubiousness, uncertainty |
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| incessancy | (noun) the quality of something that continues without end or interruption | Synonyms: ceaselessness, continuousness, incessantness |
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| incessantness | (noun) the quality of something that continues without end or interruption | Synonyms: ceaselessness, continuousness, incessancy |
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| incest | (noun) sexual intercourse between persons too closely related to marry (as between a parent and a child) | - |
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