| acuity | (noun) a quick and penetrating intelligence | Synonyms: acuteness, keenness, sharpness |
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| (noun) sharpness of vision; the visual ability to resolve fine detail (usually measured by a Snellen chart) | Synonyms: sharp-sightedness, visual acuity |
| biscuit | (noun) small round bread leavened with baking-powder or soda | - |
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| (noun) any of various small flat sweet cakes | Synonyms: cookie, cooky |
| circuit | (noun) a journey or route all the way around a particular place or area | Synonyms: tour |
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| (noun) movement once around a course | Synonyms: circle, lap |
| (noun) an electrical device that provides a path for electrical current to flow | Synonyms: electric circuit, electrical circuit |
| (noun) a racetrack for automobile races | Synonyms: racing circuit |
| (noun) (law) a judicial division of a state or the United States (so-called because originally judges traveled and held court in different locations); one of the twelve groups of states in the United States that is covered by a particular circuit court of appeals | - |
| (noun) an established itinerary of venues or events that a particular group of people travel to | - |
| (noun) the boundary line encompassing an area or object | Synonyms: circumference |
| (verb) make a circuit | - |
| circuitous | (adjective) deviating from a straight course | Synonyms: devious, roundabout |
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| (adjective) marked by obliqueness or indirection in speech or conduct | Synonyms: roundabout |
| circuitousness | (noun) The state of being roundabout, indirect or not to the point. | - |
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| circuitry | (noun) electronic equipment consisting of a system of circuits | - |
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| microcircuit | (noun) a microelectronic computer circuit incorporated into a chip or semiconductor; a whole system rather than a single component | Synonyms: integrated circuit |
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| perspicuity | (noun) clarity as a consequence of being perspicuous | Synonyms: perspicuousness, plainness |
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| promiscuity | (noun) indulging in promiscuous (casual and indiscriminate) sexual relations | Synonyms: promiscuousness, sleeping around |
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| vacuity | (noun) total lack of meaning or ideas | Synonyms: inanity, mindlessness, pointlessness, senselessness |
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| (noun) a region that is devoid of matter | Synonyms: vacuum |
| (noun) the absence of matter | Synonyms: vacuum |