| relapse | (noun) a failure to maintain a higher state | Synonyms: backsliding, lapse, lapsing, relapsing, reversion, reverting |
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| relapsing | (noun) a failure to maintain a higher state | Synonyms: backsliding, lapse, lapsing, relapse, reversion, reverting |
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| relatedness | (noun) a particular manner of connectedness | - |
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| relation | (noun) an abstraction belonging to or characteristic of two entities or parts together | - |
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| (noun) (usually plural) mutual dealings or connections among persons or groups | - |
| (noun) sexual activity between individuals, especially the insertion of a man's penis into a woman's vagina until orgasm and ejaculation occur | Synonyms: carnal knowledge, coition, coitus, copulation, intercourse, sex act, sexual congress, sexual intercourse, sexual relation |
| (noun) (law) the principle that an act done at a later time is deemed by law to have occurred at an earlier time | Synonyms: relation back |
| (noun) an act of narration | Synonyms: recounting, telling |
| (noun) a person related by blood or marriage | Synonyms: relative |
| relations | (noun) mutual dealings or connections or communications among persons or groups | Synonyms: dealings |
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| relationship | (noun) a relation between people; (`relationship' is often used where `relation' would serve, as in `the relationship between inflation and unemployment', but the preferred usage of `relationship' is for human relations or states of relatedness) | Synonyms: human relationship |
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| (noun) (anthropology) relatedness or connection by blood or marriage or adoption | Synonyms: family relationship, kinship |
| (noun) a state of connectedness between people (especially an emotional connection) | - |
| (noun) a state involving mutual dealings between people or parties or countries | - |
| relative | (noun) an animal or plant that bears a relationship to another (as related by common descent or by membership in the same genus) | Synonyms: congenator, congener, congeneric |
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| (noun) a person related by blood or marriage | Synonyms: relation |
| 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 | - |