| relativisation | (noun) the act or result of making relative or regarding as relative rather than absolute. | Synonyms: relativization |
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| relativism | (noun) (philosophy) the philosophical doctrine that all criteria of judgment are relative to the individuals and situations involved | - |
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| relativity | (noun) the quality of being relative and having significance only in relation to something else | - |
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| (noun) (physics) the theory that space and time are relative concepts rather than absolute concepts | Synonyms: Einstein's theory of relativity, relativity theory, theory of relativity |
| relativization | (noun) the act or result of making relative or regarding as relative rather than absolute. | Synonyms: relativisation |
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| relatum | (noun) a term in a proposition that is related to the referent of the proposition | - |
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| relaxant | (noun) a drug that relaxes and relieves tension | - |
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| relaxation | (noun) freedom from activity (work or strain or responsibility) | Synonyms: ease, repose, rest |
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| (noun) the act of making less strict | Synonyms: liberalisation, liberalization |
| (noun) a method of solving simultaneous equations by guessing a solution and then reducing the errors that result by successive approximations until all the errors are less than some specified amount | Synonyms: relaxation method |
| (noun) an occurrence of control or strength weakening | Synonyms: loosening, slackening |
| (noun) a feeling of refreshing tranquility and an absence of tension or worry | Synonyms: easiness |
| (noun) (physics) the exponential return of a system to equilibrium after a disturbance | Synonyms: relaxation behavior |
| (noun) (physiology) the gradual lengthening of inactive muscle or muscle fibers | - |
| relaxedness | (noun) The quality of being eased or loosened, or of having an easy-going mood or temperament. | - |
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| relaxer | (noun) any agent that produces relaxation | - |
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| relaxin | (noun) hormone secreted by the corpus luteum during the last days of pregnancy; relaxes the pelvic ligaments and prepares the uterus for labor | - |
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| relay | (noun) the act of passing something along from one person or group to another | - |
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| (noun) electrical device such that current flowing through it in one circuit can switch on and off a current in a second circuit | Synonyms: electrical relay |
| (noun) a race between teams; each member runs or swims part of the distance | Synonyms: relay race |
| (noun) a crew of workers who relieve another crew | - |
| (noun) a fresh team to relieve weary draft animals | - |
| rensselaerite | (noun) a kind of soft talc; sometimes used as wood filler | - |
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| revelation | (noun) an enlightening or astonishing disclosure | - |
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| (noun) communication of knowledge to man by a divine or supernatural agency | Synonyms: divine revelation |
| (noun) the speech act of making something evident | Synonyms: disclosure, revealing |
| roundelay | (noun) a song in which a line or phrase is repeated as the refrain | - |
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| rugelach | (noun) pastry made with a cream cheese dough and different fillings (as raisins and walnuts and cinnamon or chocolate and walnut and apricot preserves) | Synonyms: ruggelach, rugulah |
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| ruggelach | (noun) pastry made with a cream cheese dough and different fillings (as raisins and walnuts and cinnamon or chocolate and walnut and apricot preserves) | Synonyms: rugelach, rugulah |
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| selachian | (noun) any of numerous fishes of the class Chondrichthyes characterized by a cartilaginous skeleton and placoid scales: sharks, rays, skates | Synonyms: elasmobranch |
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| sequela | (noun) any abnormality following or resulting from a disease or injury or treatment | - |
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| shillelagh | (noun) a cudgel made of hardwood (usually oak or blackthorn) | Synonyms: shillalah |
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| shoelace | (noun) a lace used for fastening shoes | Synonyms: shoe lace, shoe string, shoestring |
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| spelaeologist | (noun) a person who explores caves | Synonyms: potholer, speleologist, spelunker |
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| spelaeology | (noun) the pastime of exploring caves | Synonyms: speleology |
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| (noun) the scientific study of caves | Synonyms: speleology |
| stela | (noun) an ancient upright stone slab bearing markings | Synonyms: stele |
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| steprelationship | (noun) a family relationship by virtue of remarriage | - |
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| tableland | (noun) a relatively flat highland | Synonyms: plateau |
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| telamon | (noun) a figure of a man used as a supporting column | Synonyms: atlas |
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| thelarche | (noun) the start of breast development in a woman at the beginning of puberty | - |
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| tideland | (noun) land near the sea that is overflowed by the tide | - |
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| tutelage | (noun) teaching pupils individually (usually by a tutor hired privately) | Synonyms: tuition, tutorship |
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| (noun) attention and management implying responsibility for safety | Synonyms: care, charge, guardianship |
| unrelatedness | (noun) the lack of any particular manner of connectedness | - |
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| velar | (noun) a consonant produced with the back of the tongue touching or near the soft palate | Synonyms: velar consonant |
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| wasteland | (noun) an uninhabited wilderness that is worthless for cultivation | Synonyms: barren, waste |
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| weigela | (noun) deciduous shrub widely cultivated for its white or pink or red flowers | Synonyms: Weigela florida |
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| whitelash | (noun) backlash by white racists against black civil rights advances | Synonyms: white backlash |
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| xanthelasma | (noun) xanthoma of the eyelids; occurs chiefly in the elderly | - |
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