| agent | (noun) the semantic role of the animate entity that instigates or causes the happening denoted by the verb in the clause | Synonyms: agentive role |
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| (noun) an active and efficient cause; capable of producing a certain effect | - |
| (noun) a businessman who buys or sells for another in exchange for a commission | Synonyms: broker, factor |
| (noun) a representative who acts on behalf of other persons or organizations | - |
| (noun) any agent or representative of a federal agency or bureau | Synonyms: federal agent |
| (noun) a substance that exerts some force or effect | - |
| arccotangent | (noun) the inverse function of the cotangent; the angle that has a cotangent equal to a given number | Synonyms: arc cotangent, inverse cotangent |
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| arctangent | (noun) the inverse function of the tangent; the angle that has a tangent equal to a given number | Synonyms: arc tangent, arctan, inverse tangent |
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| argent | (noun) a metal tincture used in heraldry to give a silvery appearance | - |
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| astringent | (noun) a drug that causes contraction of body tissues and canals | Synonyms: astringent drug, styptic |
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| contingent | (noun) a temporary military unit | Synonyms: detail |
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| (noun) a gathering of persons representative of some larger group | - |
| cotangent | (noun) ratio of the adjacent to the opposite side of a right-angled triangle | Synonyms: cotan |
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| detergent | (noun) a cleansing agent that differs from soap but can also emulsify oils and hold dirt in suspension | - |
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| (noun) a surface-active chemical widely used in industry and laundering | - |
| gent | (noun) informal abbreviation of `gentleman' | - |
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| (noun) a boy or man | Synonyms: blighter, bloke, chap, cuss, fella, feller, fellow, lad |
| insurgent | (noun) a person who takes part in an armed rebellion against the constituted authority (especially in the hope of improving conditions) | Synonyms: freedom fighter, insurrectionist, rebel |
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| (noun) a member of an irregular armed force that fights a stronger force by sabotage and harassment | Synonyms: guerilla, guerrilla, irregular |
| newsagent | (noun) someone who sells newspapers | Synonyms: newsdealer, newsstand operator, newsvendor |
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| reagent | (noun) a chemical agent for use in chemical reactions | - |
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| regent | (noun) someone who rules during the absence or incapacity or minority of the country's monarch | - |
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| (noun) members of a governing board | Synonyms: trustee |
| tangent | (noun) ratio of the opposite to the adjacent side of a right-angled triangle | Synonyms: tan |
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| (noun) a straight line or plane that touches a curve or curved surface at a point but does not intersect it at that point | - |