| rat | (noun) any of various long-tailed rodents similar to but larger than a mouse | - |
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| (noun) a pad (usually made of hair) worn as part of a woman's coiffure | - |
| (noun) a person who is deemed to be despicable or contemptible | Synonyms: bum, crumb, dirty dog, git, lowlife, puke, rotter, scum bag, scumbag, skunk, so-and-so, stinker, stinkpot |
| (noun) someone who works (or provides workers) during a strike | Synonyms: blackleg, scab, strikebreaker |
| (noun) one who reveals confidential information to the police or other authority | Synonyms: betrayer, blabber, informer, squealer |
| (verb) give away information about somebody | Synonyms: betray, denounce, give away, grass, shit, shop, snitch, stag, tell on |
| (verb) catch rats, especially with dogs | - |
| (verb) give (hair) the appearance of being fuller by using a rat | - |
| (verb) desert one's party or group of friends, for example, for one's personal advantage | - |
| (verb) take the place of work of someone on strike | Synonyms: blackleg, fink, scab |
| (verb) employ scabs or strike breakers in | - |
| ratability | (noun) the quality of being capable of being rated or estimated | - |
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| (noun) the state of being liable to assessment or taxation | Synonyms: rateability |
| ratable | (adjective) liable to payment of locally assessed property taxes | Synonyms: rateable |
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| ratables | (noun) property that provides tax income for local governments | Synonyms: rateables |
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| ratafee | (noun) sweet liqueur made from wine and brandy flavored with plum or peach or apricot kernels and bitter almonds | Synonyms: ratafia |
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| ratafia | (noun) sweet liqueur made from wine and brandy flavored with plum or peach or apricot kernels and bitter almonds | Synonyms: ratafee |
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| (noun) macaroon flavored with ratafia liqueur | Synonyms: ratafia biscuit |
| ratan | (noun) a switch made from the stems of the rattan palms | Synonyms: rattan |
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| rataplan | (noun) the sound made by beating a drum | Synonyms: drumbeat, rub-a-dub |
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| ratatouille | (noun) a vegetable stew; usually made with tomatoes, eggplant, zucchini, peppers, onion, and seasonings | - |
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| ratch | (noun) mechanical device consisting of a toothed wheel or rack engaged with a pawl that permits it to move in only one direction | Synonyms: rachet, ratchet |
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| ratchet | (noun) mechanical device consisting of a toothed wheel or rack engaged with a pawl that permits it to move in only one direction | Synonyms: rachet, ratch |
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| (verb) move by degrees in one direction only | Synonyms: rachet up, ratchet down |
| rate | (noun) the relative speed of progress or change | Synonyms: pace |
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| (noun) amount of a charge or payment relative to some basis | Synonyms: charge per unit |
| (noun) a quantity or amount or measure considered as a proportion of another quantity or amount or measure | - |
| (noun) a magnitude or frequency relative to a time unit | - |
| (verb) assign a rank or rating to | Synonyms: grade, order, place, range, rank |
| (verb) estimate the value of | Synonyms: value |
| (verb) be worthy of or have a certain rating | - |
| rateability | (noun) the state of being liable to assessment or taxation | Synonyms: ratability |
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| rateable | (adjective) liable to payment of locally assessed property taxes | Synonyms: ratable |
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| rateables | (noun) property that provides tax income for local governments | Synonyms: ratables |
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| ratel | (noun) nocturnal badger-like carnivore of wooded regions of Africa and southern Asia | Synonyms: honey badger, Mellivora capensis |
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| ratepayer | (noun) a person who pays local rates (especially a householder) | - |
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| rates | (noun) a local tax on property | - |
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| rather | (adverb) to a degree (not used with a negative) | Synonyms: quite |
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| (adverb) more readily or willingly | Synonyms: preferably, sooner |
| (adverb) on the contrary | Synonyms: instead |
| (adverb) to some (great or small) extent | Synonyms: kind of, kinda, sort of |
| rathole | (noun) a small dirty uncomfortable room | - |
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| (noun) a hole (as in the wall of a building) made by rats | - |
| rathskeller | (noun) a tavern below street level featuring beer; originally a German restaurant in the basement of city hall | - |
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| ratification | (noun) making something valid by formally ratifying or confirming it | Synonyms: confirmation |
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| ratified | (adjective) formally approved and invested with legal authority | Synonyms: sanctioned |
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| ratifier | (noun) someone who expresses strong approval | Synonyms: endorser, indorser, subscriber |
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| ratify | (verb) approve and express assent, responsibility, or obligation | Synonyms: sign |
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| rating | (noun) act of ascertaining or fixing the value or worth of | Synonyms: evaluation |
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| (noun) an appraisal of the value of something | Synonyms: evaluation, valuation |
| (noun) standing or position on a scale | - |
| (noun) rank in a military organization | Synonyms: military rank, military rating, paygrade |
| ratio | (noun) the relation between things (or parts of things) with respect to their comparative quantity, magnitude, or degree | Synonyms: proportion |
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| (noun) the relative magnitudes of two quantities (usually expressed as a quotient) | - |
| ratiocinate | (verb) reason methodologically and logically | - |
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| ratiocination | (noun) logical and methodical reasoning | - |
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| (noun) the proposition arrived at by logical reasoning (such as the proposition that must follow from the major and minor premises of a syllogism) | Synonyms: conclusion |
| ratiocinative | (adjective) based on exact thinking | - |
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| ratiocinator | (noun) someone who reasons logically | Synonyms: reasoner |
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| ration | (noun) the food allowance for one day (especially for service personnel) | - |
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| (noun) a fixed portion that is allotted (especially in times of scarcity) | - |
| (verb) distribute in rations, as in the army | Synonyms: ration out |
| (verb) restrict the consumption of a relatively scarce commodity, as during war | - |
| rational | (adjective) consistent with or based on or using reason | - |
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| (adjective) capable of being expressed as a quotient of integers | - |
| (adjective) having its source in or being guided by the intellect (as distinguished from experience or emotion) | - |
| (adjective) of or associated with or requiring the use of the mind | Synonyms: intellectual, noetic |
| (noun) an integer or a fraction | Synonyms: rational number |
| rationale | (noun) (law) an explanation of the fundamental reasons (especially an explanation of the working of some device in terms of laws of nature) | Synonyms: principle |
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| rationalisation | (noun) systematic organization; the act of organizing something according to a system or a rationale | Synonyms: rationalization, systematisation, systematization |
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| (noun) (mathematics) the simplification of an expression or equation by eliminating radicals without changing the value of the expression or the roots of the equation | Synonyms: rationalization |
| (noun) the organization of a business according to scientific principles of management in order to increase efficiency | Synonyms: rationalization |
| (noun) the cognitive process of making something seem consistent with or based on reason | Synonyms: rationalization |
| (noun) (psychiatry) a defense mechanism by which your true motivation is concealed by explaining your actions and feelings in a way that is not threatening | Synonyms: rationalization |
| rationalise | (verb) weed out unwanted or unnecessary things | Synonyms: cut, prune, rationalize |
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| (verb) remove irrational quantities from | Synonyms: rationalize |
| (verb) think rationally; employ logic or reason | Synonyms: rationalize |
| (verb) defend, explain, clear away, or make excuses for by reasoning | Synonyms: apologise, apologize, excuse, rationalize |
| (verb) structure and run according to rational or scientific principles in order to achieve desired results | Synonyms: rationalize |
| rationalism | (noun) the doctrine that reason is the right basis for regulating conduct | Synonyms: freethinking |
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| (noun) (philosophy) the doctrine that knowledge is acquired by reason without resort to experience | - |
| (noun) the theological doctrine that human reason rather than divine revelation establishes religious truth | - |
| rationalist | (adjective) of or relating to or characteristic of rationalism | - |
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| (noun) someone who emphasizes observable facts and excludes metaphysical speculation about origins or ultimate causes | Synonyms: positivist |
| rationalistic | (adjective) of or relating to the philosophical doctrine of rationalism | - |
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| rationality | (noun) the quality of being consistent with or based on logic | Synonyms: rationalness |
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| (noun) the state of having good sense and sound judgment | Synonyms: reason, reasonableness |
| rationalization | (noun) systematic organization; the act of organizing something according to a system or a rationale | Synonyms: rationalisation, systematisation, systematization |
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| (noun) (mathematics) the simplification of an expression or equation by eliminating radicals without changing the value of the expression or the roots of the equation | Synonyms: rationalisation |
| (noun) the organization of a business according to scientific principles of management in order to increase efficiency | Synonyms: rationalisation |
| (noun) the cognitive process of making something seem consistent with or based on reason | Synonyms: rationalisation |
| (noun) (psychiatry) a defense mechanism by which your true motivation is concealed by explaining your actions and feelings in a way that is not threatening | Synonyms: rationalisation |
| rationalize | (verb) weed out unwanted or unnecessary things | Synonyms: cut, prune, rationalise |
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| (verb) remove irrational quantities from | Synonyms: rationalise |
| (verb) think rationally; employ logic or reason | Synonyms: rationalise |
| (verb) defend, explain, clear away, or make excuses for by reasoning | Synonyms: apologise, apologize, excuse, rationalise |
| (verb) structure and run according to rational or scientific principles in order to achieve desired results | Synonyms: rationalise |
| rationally | (adverb) in a rational manner | - |
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| rationalness | (noun) the quality of being consistent with or based on logic | Synonyms: rationality |
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| rationed | (adjective) distributed equitably in limited individual portions | - |
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| rationing | (noun) the act of rationing | - |
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| ratite | (noun) flightless birds having flat breastbones lacking a keel for attachment of flight muscles: ostriches, cassowaries, emus, moas, rheas, kiwis, elephant birds | Synonyms: flightless bird, ratite bird |
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| ratlike | (adjective) resembling or characteristic of a rat | - |
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| ratlin | (noun) (nautical) a small horizontal rope between the shrouds of a sailing ship; they form a ladder for climbing aloft | Synonyms: ratline |
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| ratline | (noun) (nautical) a small horizontal rope between the shrouds of a sailing ship; they form a ladder for climbing aloft | Synonyms: ratlin |
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| ratsbane | (noun) a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killer | Synonyms: arsenic, arsenic trioxide, arsenous anhydride, arsenous oxide, white arsenic |
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| rattail | (noun) deep-sea fish with a large head and body and long tapering tail | Synonyms: grenadier, rattail fish |
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| rattan | (noun) a switch made from the stems of the rattan palms | Synonyms: ratan |
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| (noun) climbing palm of Sri Lanka and southern India remarkable for the great length of the stems which are used for malacca canes | Synonyms: Calamus rotang, rattan palm |
| (noun) the stem of various climbing palms of the genus Calamus and related genera used to make wickerwork and furniture and canes | Synonyms: rattan cane |
| ratter | (noun) any of several breeds of terrier developed to catch rats | Synonyms: rat terrier |
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| (noun) a disloyal person who betrays or deserts his cause or religion or political party or friend etc. | Synonyms: apostate, deserter, recreant, renegade, turncoat |
| ratting | (noun) to furnish incriminating evidence to an officer of the law (usually in return for favors) | Synonyms: informing |
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| rattle | (noun) loosely connected horny sections at the end of a rattlesnake's tail | - |
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| (noun) a baby's toy that makes percussive noises when shaken | - |
| (noun) a rapid series of short loud sounds (as might be heard with a stethoscope in some types of respiratory disorders) | Synonyms: rale, rattling |
| (verb) shake and cause to make a rattling noise | - |
| (verb) make short successive sounds | - |
| rattlebox | (noun) any of various plants of the genus Crotalaria having inflated pods within which the seeds rattle; used for pasture and green-manure crops | Synonyms: crotalaria |
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| rattlebrained | (adjective) lacking sense or discretion | Synonyms: rattlepated, scatterbrained, scatty |
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| rattled | (adjective) thrown into a state of agitated confusion; (`rattled' is an informal term) | Synonyms: flustered, hot and bothered, perturbed |
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| rattlepated | (adjective) lacking sense or discretion | Synonyms: rattlebrained, scatterbrained, scatty |
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| rattler | (noun) pit viper with horny segments at the end of the tail that rattle when shaken | Synonyms: rattlesnake |
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| (noun) a railroad train consisting of freight cars | Synonyms: freight train |
| rattlesnake | (noun) pit viper with horny segments at the end of the tail that rattle when shaken | Synonyms: rattler |
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| rattling | (adjective) quick and energetic | Synonyms: alert, brisk, lively, merry, snappy, spanking, zippy |
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| (adjective) extraordinarily good or great; used especially as intensifiers | Synonyms: fantastic, grand, howling, marvellous, marvelous, phenomenal, terrific, tremendous, wonderful, wondrous |
| (noun) a rapid series of short loud sounds (as might be heard with a stethoscope in some types of respiratory disorders) | Synonyms: rale, rattle |
| (adverb) used to give emphasis | Synonyms: real, really, very |
| rattrap | (noun) a trap for catching rats | - |
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| (noun) filthy run-down dilapidated housing | - |
| (noun) a difficult entangling situation | - |
| ratty | (adjective) of or characteristic of rats | - |
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| (adjective) dirty and infested with rats | - |
| (adjective) showing signs of wear and tear | Synonyms: moth-eaten, shabby, tatty |