| call | (noun) (sports) the decision made by an umpire or referee | - |
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| (noun) a visit in an official or professional capacity | - |
| (noun) a brief social visit | - |
| (noun) the option to buy a given stock (or stock index or commodity future) at a given price before a given date | Synonyms: call option |
| (noun) a method of contacting a person by phone | Synonyms: phone call, telephone call |
| (noun) a loud utterance; often in protest or opposition | Synonyms: cry, outcry, shout, vociferation, yell |
| (noun) the characteristic sound produced by a bird | Synonyms: birdcall, birdsong, song |
| (noun) a request | - |
| (noun) a demand | Synonyms: claim |
| (noun) a demand for a show of hands in a card game | - |
| (noun) an instruction that interrupts the program being executed | - |
| (noun) a demand by a broker that a customer deposit enough to bring his margin up to the minimum requirement | Synonyms: margin call |
| calla | (noun) South African plant widely cultivated for its showy pure white spathe and yellow spadix | Synonyms: arum lily, calla lily, Zantedeschia aethiopica |
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| callathump | (noun) a noisy mock serenade (made by banging pans and kettles) to a newly married couple | Synonyms: belling, callithump, charivari, chivaree, shivaree |
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| (noun) a noisy boisterous parade | Synonyms: callithump, callithump parade |
| callback | (noun) a request by the manufacturer of a defective product to return the product (as for replacement or repair) | Synonyms: recall |
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| caller | (noun) a social or business visitor | Synonyms: company |
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| (noun) the person initiating a telephone call | Synonyms: caller-up, phoner, telephoner |
| (noun) the person who convenes a meeting | - |
| (noun) someone who proclaims or summons in a loud voice | - |
| (noun) a person who announces the changes of steps during a dance | Synonyms: caller-out |
| (noun) the bettor in a card game who matches the bet and calls for a show of hands | - |
| (noun) an investor who buys a call option | - |
| calliandra | (noun) any of various shrubs and small trees valued for their fine foliage and attractive spreading habit and clustered white to deep pink or red flowers | - |
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| calligrapher | (noun) someone skilled in penmanship | Synonyms: calligraphist |
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| calligraphist | (noun) someone skilled in penmanship | Synonyms: calligrapher |
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| calligraphy | (noun) beautiful handwriting | Synonyms: chirography, penmanship |
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| calling | (noun) the particular occupation for which you are trained | Synonyms: career, vocation |
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| calliope | (noun) a musical instrument consisting of a series of steam whistles played from a keyboard | Synonyms: steam organ |
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| calliopsis | (noun) North American annual widely cultivated for its yellow flowers with purple-red to brownish centers; in some classifications placed in a subgenus Calliopsis | Synonyms: Coreopsis tinctoria |
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| calliper | (noun) an instrument for measuring the distance between two points | Synonyms: caliper |
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| callisthenics | (noun) the practice of calisthenic exercises | Synonyms: calisthenics |
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| (noun) light exercises designed to promote general fitness | Synonyms: calisthenics |
| callithump | (noun) a noisy mock serenade (made by banging pans and kettles) to a newly married couple | Synonyms: belling, callathump, charivari, chivaree, shivaree |
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| (noun) a noisy boisterous parade | Synonyms: callathump, callithump parade |
| callosectomy | (noun) severing the corpus callosum so that communication between the cerebral hemispheres is interrupted (in cases of severe intractable epilepsy) | Synonyms: callosotomy |
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| callosity | (noun) devoid of passion or feeling; hardheartedness | Synonyms: callousness, hardness, insensibility, unfeelingness |
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| (noun) an area of skin that is thick or hard from continual pressure or friction (as the sole of the foot) | Synonyms: callus |
| callosotomy | (noun) severing the corpus callosum so that communication between the cerebral hemispheres is interrupted (in cases of severe intractable epilepsy) | Synonyms: callosectomy |
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| callousness | (noun) devoid of passion or feeling; hardheartedness | Synonyms: callosity, hardness, insensibility, unfeelingness |
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| callowness | (noun) lacking and evidencing lack of experience of life | Synonyms: jejuneness, juvenility |
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| callus | (noun) (botany) an isolated thickening of tissue, especially a stiff protuberance on the lip of an orchid | - |
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| (noun) bony tissue formed during the healing of a fractured bone | - |
| (noun) an area of skin that is thick or hard from continual pressure or friction (as the sole of the foot) | Synonyms: callosity |