| Date added | Word | Definition |
|---|---|---|
| 2020-11-11 | pseudogravitational adj. (1942) | of or relating to pseudogravity n. |
| 2020-11-11 | pseudo-gravitation n. (1941) | = pseudogravity n. |
| 2020-11-11 | time radio n. (1934) | a device that allows messages (but not physical objects) to be sent across time |
| 2020-11-11 | unobtainium n. (1956) | a hypothetical substance that would be highly desirable but is unrealized or unobtainable; a notional substance with exceptional or ideal properties |
| 2020-11-11 | plane n. (1927) | = dimension n. |
| 2020-11-11 | omniverse n. (1948) | all universes collectively; cf. multiverse n. 1 |
| 2020-11-11 | contragravity n. (1929) | = antigravity n. |
| 2020-11-11 | time hopper n. 1 (1955) | = time machine n. |
| 2020-11-11 | time hopper n. 2 (1967) | = time traveller n. |
| 2020-11-11 | red pill n. (1998) | a drug that reveals esp. unpleasant truths of the real world; cf. blue pill n. |
| 2020-11-11 | blue pill n. (1998) | a drug that allows one to remain ignorant of reality; cf. red pill n. |
| 2020-11-11 | time police n. (1950) | officers who travels through time to attempt to prevent the past from being changed; a governmental body that regulates time travel |
| 2020-11-11 | time fault n. (1934) | a disturbance in time; a place where time travel is possible, or where time progresses in unpredictable ways; cf. timeslip n., time storm n. |
| 2020-11-10 | nowhen adv. (1982) | (in time-travel contexts): in or at no time |
| 2020-11-10 | Standard n. (1952) | (the name of) a language spoken on multiple worlds or by multiple species; the common language of a group or place; cf. Galactic n. 2 |
| 2020-11-10 | everywhen n. (1942) | (in time-travel contexts) all points in time |
| 2020-11-10 | Anglic n. (1950) | a future language descended from Modern English |
| 2020-11-06 | -con suffix (1940) | (used to form the names of conventions, with the first element indicating the location or (typically in informal designations) the main subject or focus of the event) cf. con n. |
| 2020-11-06 | Dark Side n. 2 (1975) | the force of evil |
| 2020-11-06 | eyetracks n. (1952) | imaginary marks left on a book by the act of reading it |
| 2020-11-05 | gravity plate n. (1932) | a device that creates or nullifies the effects of gravity |
| 2020-11-04 | Law of Robotics n. (1944) | in the writing of Isaac Asimov: each of three (later sometimes four) rules devised to govern the behaviour of robots |
| 2020-11-03 | motherworld n. (1928) | the planet on which a species originated; cf. homeworld n. |
| 2020-11-03 | novum n. (1972) | an element in a work of science fiction that establishes that the work takes place in a non-normal world; the key science-fictional element in a work |
| 2020-11-03 | impossible story n. (1913) | esp. in the early pulp era: a work of imaginative fiction; a different story n. |
| 2020-11-02 | space force n. (1932) | a branch of the military that acts in outer space |
| 2020-11-02 | starway n. (1932) | an established route between stars; usu. pl. starways the realm of space travel in general; cf. spaceway n. |
| 2020-11-02 | pod person adj. (1956) | an alien, a monster; a person considered to be conformist, unoriginal, or emotionless; one who lacks personality or individuality |
| 2020-11-01 | system-wide adj. (1935) | extending or existing throughout or across a solar system |
| 2020-11-01 | seetee n. (1942) | = contraterrene matter |
| 2020-10-29 | sapience n. (1962) | (of non-humans) intelligence |
| 2020-10-25 | inner space n. (1920) | the human mind; the innermost parts of oneβs psyche |
| 2020-10-22 | flame gun n. (1934) | a gun (esp. a handgun) that shoots flames; cf. flame pistol n. |
| 2020-10-22 | tight-beamed adj. (1951) | of a message: sent by means of a tight-beam n. |
| 2020-10-22 | tight-beam v. (1959) | to send (esp. a message) by means of a tight-beam n.; to send to (someone) by means of a tight-beam n.; also intrans. |
| 2020-10-20 | time viewer n. (1940) | = chronoscope n. |
| 2020-10-20 | time storm n. (1942) | a disturbance in time which can bring people and things from different times into the same timeline; cf. timequake n., timeslip n. |
| 2020-10-20 | timeslip n. (1941) | a rift or flaw in the fabric of time that allows travel between two or more periods of time or timelines; any accidental or unexplained movement between periods of time; cf. timequake n., time storm n. |
| 2020-10-20 | time-path n. (1934) | = timestream n. |
| 2020-10-20 | time cop n. (1953) | a member of the time police n. |
| 2020-10-20 | Terran n. 2 (1952) | a common language spoken on Earth or by Earthlings |
| 2020-10-20 | temporal paradox n. (1954) | = time paradox n. |
| 2020-10-20 | uptime adj. (1978) | esp. in time-travel contexts: in or from the future; cf. downtime adj. |
| 2020-10-20 | uptime adv. (1972) | esp. in time-travel contexts: in, into, or toward the future; cf. downtime adv. |
| 2020-10-19 | unhuman n. (1944) | an intelligent nonhuman entity; alien n.; cf. non-human n. |
| 2020-10-19 | unperson n. (1949) | a person who, usually for political reasons, is deemed not to have existed and whose name is removed from all public records; hence, more generally: a person whose contributions or achievements are officially denied or disregarded; a person regarded as less than human |
| 2020-10-19 | ultradrive n. (1951) | a type of faster-than-light star drive |
| 2020-10-18 | xeno- prefix (1962) | (used to form words indicating that the base element is or relates to an alien) |
| 2020-10-17 | X-Phile n. (1994) | a fan of the TV show The X-Files |
| 2020-10-16 | Anglofan n. (1941) | a science fiction fan who is a native or resident of the United Kingdom |