| semi | (noun) a trailer having wheels only in the rear; the front is supported by the towing vehicle | Synonyms: semitrailer |
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| (noun) a truck consisting of a tractor and trailer together | Synonyms: articulated lorry, rig, tractor trailer, trailer truck, trucking rig |
| (noun) one of the two competitions in the next to the last round of an elimination tournament | Synonyms: semifinal |
| semiabstract | (adjective) characterized by stylized but recognizable subject matter | - |
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| semiannual | (adjective) occurring or payable twice each year | Synonyms: biannual, biyearly, half-yearly |
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| semiannually | (adverb) twice a year | Synonyms: biyearly |
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| semiaquatic | (adjective) partially aquatic; living or growing partly on land and partly in water | Synonyms: subaquatic |
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| (adjective) having an aquatic early or larval form and a terrestrial adult form | Synonyms: amphibiotic |
| semiarid | (adjective) somewhat arid | - |
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| semiautobiographical | (adjective) of or relating to a work that combines autobiography and fiction | - |
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| semiautomatic | (adjective) (of firearms) capable of automatic loading and firing continuously | Synonyms: autoloading, self-loading |
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| (adjective) partially automatic | - |
| (noun) a pistol that is a semiautomatic firearm capable of loading and firing continuously | Synonyms: semiautomatic pistol |
| semibreve | (noun) a musical note having the longest time value (equal to four beats in common time) | Synonyms: whole note |
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| semicentenary | (adjective) of or relating to or marking the 50th anniversary | Synonyms: semicentennial |
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| (noun) the 50th anniversary (or the celebration of it) | Synonyms: semicentennial |
| semicentennial | (adjective) of or relating to or marking the 50th anniversary | Synonyms: semicentenary |
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| (noun) the 50th anniversary (or the celebration of it) | Synonyms: semicentenary |
| semicircle | (noun) a plane figure with the shape of half a circle | Synonyms: hemicycle |
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| semicircular | (adjective) curved into a half circle | - |
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| semicoke | (noun) Semicoke is a solid residue obtained by carbonization of coal at a relatively low temperature (below 700° C). | - |
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| semicolon | (noun) a punctuation mark (;) used to connect independent clauses; indicates a closer relation than does a period | - |
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| semicoma | (noun) a mild comatose state; a coma from which the person can be roused by appropriate stimuli | - |
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| semicomatose | (adjective) in a state of partial coma | - |
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| semiconducting | (adjective) having characteristics of a semiconductor; that is having electrical conductivity greater than insulators but less than good conductors | Synonyms: semiconductive |
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| semiconductive | (adjective) having characteristics of a semiconductor; that is having electrical conductivity greater than insulators but less than good conductors | Synonyms: semiconducting |
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| semiconductor | (noun) a conductor made with semiconducting material | Synonyms: semiconductor device, semiconductor unit |
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| (noun) a substance as germanium or silicon whose electrical conductivity is intermediate between that of a metal and an insulator; its conductivity increases with temperature and in the presence of impurities | Synonyms: semiconducting material |
| semiconscious | (adjective) partially conscious; not completely aware of sensations | - |
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| semiconsciousness | (noun) marginal consciousness | Synonyms: grogginess, stupefaction, stupor |
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| semidark | (adjective) partially devoid of light or brightness | - |
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| semidarkness | (noun) partial darkness | - |
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| semidesert | (noun) a region much like a desert but usually located between a desert and the surrounding regions | - |
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| semidetached | (adjective) attached on one side only | - |
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| semidiameter | (noun) the apparent radius of a celestial body when viewed as a disc from the earth | - |
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| semiempirical | (adjective) relying to some extent on observation or experiment | - |
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| semiepiphyte | (noun) a plant that is an epiphyte for part of its life | Synonyms: hemiepiphyte |
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| semifinal | (noun) one of the two competitions in the next to the last round of an elimination tournament | Synonyms: semi |
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| semifinalist | (noun) one of four competitors remaining in a tournament by elimination | - |
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| semifluidity | (noun) a property midway between a solid and a liquid | - |
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| semiformal | (adjective) moderately formal; requiring a dinner jacket | Synonyms: black-tie, semi-formal |
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| semigloss | (noun) a paint that dries with a finish between glossy and flat | - |
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| semihard | (adjective) somewhat hard | - |
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| semilegality | (noun) The property of being of partial or questionable legality. | Synonyms: semi-legality |
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| semiliquid | (adjective) somewhat liquid | - |
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| semiliterate | (adjective) literate but poorly informed | - |
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| (adjective) barely able to read and write | - |
| (adjective) able to read but not to write | - |
| semilunar | (adjective) resembling the new moon in shape | Synonyms: crescent-shaped, crescent, lunate |
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| semimonthly | (adjective) occurring twice a month | Synonyms: bimonthly |
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| (noun) a periodical that is published twice each month (or 24 issues per year) | - |
| (adverb) twice a month | Synonyms: bimonthly |
| seminal | (adjective) pertaining to or containing or consisting of semen | - |
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| (adjective) containing seeds of later development | Synonyms: germinal, originative |
| seminar | (noun) a course offered for a small group of advanced students | - |
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| (noun) any meeting for an exchange of ideas | - |
| seminarian | (noun) a student at a seminary (especially a Roman Catholic seminary) | Synonyms: seminarist |
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| seminarist | (noun) a student at a seminary (especially a Roman Catholic seminary) | Synonyms: seminarian |
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| seminary | (noun) a theological school for training ministers or priests or rabbis | - |
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| (noun) a private place of education for the young | - |
| seminiferous | (adjective) bearing or producing seed or semen | - |
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| seminoma | (noun) malignant tumor of the testis; usually occurring in older men | Synonyms: testicular cancer |
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| seminude | (adjective) partially clothed | - |
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| semiofficial | (adjective) having some official authority or sanction | - |
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| semiology | (noun) (philosophy) a philosophical theory of the functions of signs and symbols | Synonyms: semiotics |
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| semiopaque | (adjective) partially opaque | - |
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| semiotic | (adjective) of or relating to semiotics | Synonyms: semiotical |
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| semiotical | (adjective) of or relating to semiotics | Synonyms: semiotic |
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| semiotician | (noun) a specialist in the study of meaning | Synonyms: semanticist |
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| semiotics | (noun) (philosophy) a philosophical theory of the functions of signs and symbols | Synonyms: semiology |
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| semiparasite | (noun) a parasitic plant that contains some chlorophyll and therefore is capable of photosynthesis | Synonyms: hemiparasite |
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| semiparasitic | (adjective) of or relating to plants that are semiparasites | - |
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| semipermanent | (adjective) relating to or extending over a relatively long time | Synonyms: long-run, long-term |
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| semipermeable | (adjective) (of a membrane) selectively permeable | - |
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| semipolitical | (adjective) political in some (but not all) aspects | - |
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| semiprecious | (adjective) used of gemstones having less commercial value than precious stones | - |
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| semiprivate | (adjective) confined to a small number of hospital patients | - |
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| semipro | (noun) an athlete who plays for pay on a part-time basis | Synonyms: semiprofessional |
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| semiprofessional | (noun) an athlete who plays for pay on a part-time basis | Synonyms: semipro |
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| semipublic | (adjective) having some of the features of public institution | - |
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| semiquaver | (noun) a musical note having the time value of a sixteenth of a whole note | Synonyms: sixteenth note |
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| semirigid | (adjective) not fully rigid | - |
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| (adjective) having a form maintained by a rigid internal structure as well as by internal gas pressure | - |
| semiskilled | (adjective) possessing or requiring limited skills | - |
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| semisoft | (adjective) somewhat soft | Synonyms: softish |
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| semisolid | (adjective) partly solid; having a rigidity and viscosity intermediate between a solid and a liquid | - |
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| semisweet | (adjective) having a taste that is a mixture of bitterness and sweetness | Synonyms: bittersweet |
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| semisynthetic | (adjective) not of natural origin; prepared or made artificially | Synonyms: man-made, synthetic |
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| semiterrestrial | (adjective) chiefly but not exclusively terrestrial | - |
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| semitone | (noun) the musical interval between adjacent keys on a keyboard instrument | Synonyms: half step |
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| semitrailer | (noun) a trailer having wheels only in the rear; the front is supported by the towing vehicle | Synonyms: semi |
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| semitrance | (noun) a trancelike state in which the person can follow instructions but voluntary action is weak or absent | - |
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| semitransparency | (noun) the quality of allowing light to pass diffusely | Synonyms: translucence, translucency |
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| semitransparent | (adjective) allowing light to pass through diffusely | Synonyms: translucent |
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| semitropic | (adjective) of or relating to or characteristic of conditions in the subtropics | Synonyms: semitropical, subtropic, subtropical |
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| semitropical | (adjective) of or relating to or characteristic of conditions in the subtropics | Synonyms: semitropic, subtropic, subtropical |
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| semitropics | (noun) regions adjacent to the tropics | Synonyms: subtropics |
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| semivowel | (noun) a vowellike sound that serves as a consonant | Synonyms: glide |
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| semiweekly | (adjective) occurring twice a week | Synonyms: biweekly |
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| (noun) a periodical that is published twice each week (or 104 issues per year) | - |
| (adverb) twice a week | Synonyms: biweekly |