| retrogression | (noun) returning to a former state | Synonyms: regress, regression, retroversion, reversion |
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| (noun) passing from a more complex to a simpler biological form | Synonyms: degeneration |
| retroversion | (noun) returning to a former state | Synonyms: regress, regression, retrogression, reversion |
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| (noun) translation back into the original language | - |
| (noun) a turning or tilting backward of an organ or body part | Synonyms: retroflection, retroflexion |
| retrovision | (noun) a vision of events in the distant past | - |
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| reversion | (noun) a failure to maintain a higher state | Synonyms: backsliding, lapse, lapsing, relapse, relapsing, reverting |
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| (noun) turning in the opposite direction | Synonyms: reversal, reverse, turnabout, turnaround |
| (noun) returning to a former state | Synonyms: regress, regression, retrogression, retroversion |
| (noun) (genetics) a return to a normal phenotype (usually resulting from a second mutation) | - |
| (noun) a reappearance of an earlier characteristic | Synonyms: atavism, throwback |
| (noun) (law) an interest in an estate that reverts to the grantor (or his heirs) at the end of some period (e.g., the death of the grantee) | - |
| reversioner | (noun) (law) a party who is entitled to an estate in reversion | - |
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| reversionist | (noun) someone who lapses into previous undesirable patterns of behavior | Synonyms: backslider, recidivist |
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| revision | (noun) the act of revising or altering (involving reconsideration and modification) | Synonyms: alteration |
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| (noun) something that has been written again | Synonyms: rescript, rewrite |
| (noun) the act of rewriting something | Synonyms: rescript, revisal, revise |
| revisionism | (noun) a moderate evolutionary form of Marxism | - |
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| (noun) any dangerous departure from the teachings of Marx | - |
| revisionist | (noun) a Communist who tries to rewrite Marxism to justify a retreat from the revolutionary position | - |
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| revulsion | (noun) intense aversion | Synonyms: horror, repugnance, repulsion |
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| scansion | (noun) analysis of verse into metrical patterns | - |
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| scission | (noun) the act of dividing by cutting or splitting | - |
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| secession | (noun) formal separation from an alliance or federation | Synonyms: withdrawal |
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| (noun) an Austrian school of art and architecture parallel to the French art nouveau in the 1890s | Synonyms: sezession |
| secessionism | (noun) a doctrine that maintains the right of secession | - |
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| secessionist | (noun) an advocate of secessionism | - |
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| seclusion | (noun) the act of secluding yourself from others | - |
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| (noun) the quality of being secluded from the presence or view of others | Synonyms: privacy, privateness |
| semiprofessional | (noun) an athlete who plays for pay on a part-time basis | Synonyms: semipro |
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| session | (noun) a meeting devoted to a particular activity | - |
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| (noun) a meeting for execution of a group's functions | - |
| (noun) a meeting of spiritualists | Synonyms: seance, sitting |
| (noun) the time during which a school holds classes | Synonyms: academic session, academic term, school term |
| sezession | (noun) an Austrian school of art and architecture parallel to the French art nouveau in the 1890s | Synonyms: secession |
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| suasion | (noun) the act of persuading (or attempting to persuade); communication intended to induce belief or action | Synonyms: persuasion |
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| subdimension | (noun) a partial dimension that constitutes the entire dimension of a given object. | - |
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| subdivision | (noun) the act of subdividing; division of something previously divided | - |
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| (noun) a section of a section; a part of a part; i.e., a part of something already divided | Synonyms: subsection |
| (noun) a self-contained part of a larger composition (written or musical) | Synonyms: section |
| (noun) a division of some larger or more complex organization | Synonyms: arm, branch |
| (noun) an area composed of subdivided lots | - |
| submersion | (noun) the act of wetting something by submerging it | Synonyms: dousing, ducking, immersion |
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| (noun) sinking until covered completely with water | Synonyms: immersion, submergence, submerging |
| submission | (noun) the act of submitting; usually surrendering power to another | Synonyms: compliance |
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| (noun) something (manuscripts or architectural plans and models or estimates or works of art of all genres etc.) submitted for the judgment of others (as in a competition) | Synonyms: entry |
| (noun) an agreement between parties in a dispute to abide by the decision of an arbiter | - |
| (noun) a legal document summarizing an agreement between parties in a dispute to abide by the decision of an arbiter | - |
| (noun) (law) a contention presented by a lawyer to a judge or jury as part of the case he is arguing | - |
| (noun) the feeling of patient, submissive humbleness | Synonyms: meekness |
| (noun) the condition of having submitted to control by someone or something else | - |
| subversion | (noun) destroying someone's (or some group's) honesty or loyalty; undermining moral integrity | Synonyms: corruption |
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| (noun) the act of subverting; as overthrowing or destroying a legally constituted government | Synonyms: subversive activity |
| succession | (noun) the action of following in order | Synonyms: sequence |
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| (noun) acquisition of property by descent or by will | Synonyms: taking over |
| (noun) a following of one thing after another in time | Synonyms: chronological sequence, chronological succession, sequence, successiveness |
| (noun) a group of people or things arranged or following in order | - |
| (noun) (ecology) the gradual and orderly process of change in an ecosystem brought about by the progressive replacement of one community by another until a stable climax is established | Synonyms: ecological succession |
| succussion | (noun) shaking a person to determine whether a large amount of liquid is present in a body cavity | - |
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| suffusion | (noun) the process of permeating or infusing something with a substance | Synonyms: permeation, pervasion |
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| supersession | (noun) act of replacing one person or thing by another especially one held to be superior | Synonyms: supersedure |
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| supervision | (noun) management by overseeing the performance or operation of a person or group | Synonyms: oversight, superintendence, supervising |
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| suppression | (noun) the act of withholding or withdrawing some book or writing from publication or circulation | Synonyms: curtailment |
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| (noun) forceful prevention; putting down by power or authority | Synonyms: crushing, quelling, stifling |
| (noun) (psychology) the conscious exclusion of unacceptable thoughts or desires | Synonyms: inhibition |
| (noun) the failure to develop some part or organ | - |
| suspension | (noun) the act of suspending something (hanging it from above so it moves freely) | Synonyms: dangling, hanging |
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| (noun) a temporary debarment (from a privilege or position etc) | Synonyms: temporary removal |
| (noun) a mechanical system of springs or shock absorbers connecting the wheels and axles to the chassis of a wheeled vehicle | Synonyms: suspension system |
| (noun) an interruption in the intensity or amount of something | Synonyms: abatement, hiatus, reprieve, respite |
| (noun) temporary cessation or suspension | Synonyms: abeyance |
| (noun) a mixture in which fine particles are suspended in a fluid where they are supported by buoyancy | - |
| (noun) a time interval during which there is a temporary cessation of something | Synonyms: break, intermission, interruption, pause |
| symphysion | (noun) the most forward point of the alveolar process of the mandible | - |
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| television | (noun) a telecommunication system that transmits images of objects (stationary or moving) between distant points | Synonyms: television system |
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| (noun) an electronic device that receives television signals and displays them on a screen | Synonyms: boob tube, goggle box, idiot box, television receiver, television set, telly, tv, tv set |
| (noun) broadcasting visual images of stationary or moving objects | Synonyms: telecasting, TV, video |
| tension | (noun) the action of stretching something tight | - |
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| (noun) (physics) a stress that produces an elongation of an elastic physical body | - |
| (noun) feelings of hostility that are not manifest | Synonyms: latent hostility |
| (noun) the physical condition of being stretched or strained | Synonyms: tautness, tenseness, tensity |
| (noun) a balance between and interplay of opposing elements or tendencies (especially in art or literature) | - |
| (noun) (psychology) a state of mental or emotional strain or suspense | Synonyms: stress, tenseness |
| torsion | (noun) a twisting force | Synonyms: torque |
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| (noun) a tortuous and twisted shape or position | Synonyms: contortion, crookedness, tortuosity, tortuousness |
| transfusion | (noun) the introduction of blood or blood plasma into a vein or artery | Synonyms: blood transfusion |
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| (noun) the action of pouring a liquid from one vessel to another | - |
| transgression | (noun) the act of transgressing; the violation of a law or a duty or moral principle | Synonyms: evildoing |
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| (noun) the action of going beyond or overstepping some boundary or limit | - |
| (noun) the spreading of the sea over land as evidenced by the deposition of marine strata over terrestrial strata | - |
| transmission | (noun) the act of sending a message; causing a message to be transmitted | Synonyms: transmittal, transmitting |
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| (noun) the gears that transmit power from an automobile engine via the driveshaft to the live axle | Synonyms: transmission system |
| (noun) communication by means of transmitted signals | - |
| (noun) an incident in which an infectious disease is transmitted | Synonyms: contagion, infection |
| (noun) the fraction of radiant energy that passes through a substance | Synonyms: transmittance |
| version | (noun) manual turning of a fetus in the uterus (usually to aid delivery) | - |
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| (noun) a mental representation of the meaning or significance of something | Synonyms: interpretation, reading |
| (noun) something a little different from others of the same type | Synonyms: edition, variant, variation |
| (noun) a written communication in a second language having the same meaning as the written communication in a first language | Synonyms: interlingual rendition, rendering, translation |
| (noun) an interpretation of a matter from a particular viewpoint | - |
| (noun) a written work (as a novel) that has been recast in a new form | Synonyms: adaptation |
| vision | (noun) the ability to see; the visual faculty | Synonyms: sight, visual modality, visual sense |
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| (noun) the perceptual experience of seeing | Synonyms: visual sensation |
| (noun) a vivid mental image | - |
| (noun) the formation of a mental image of something that is not perceived as real and is not present to the senses | Synonyms: imagination, imaginativeness |
| (noun) a religious or mystical experience of a supernatural appearance | - |
| visionariness | (noun) The state or condition of being imaginary or illusory. | - |
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| visionary | (noun) a person with unusual powers of foresight | Synonyms: illusionist, seer |
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| (noun) a person given to fanciful speculations and enthusiasms with little regard for what is actually possible | - |