| 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 |
| semiautomatic | (noun) a pistol that is a semiautomatic firearm capable of loading and firing continuously | Synonyms: semiautomatic pistol |
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| 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 | (noun) the 50th anniversary (or the celebration of it) | Synonyms: semicentennial |
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| semicentennial | (noun) the 50th anniversary (or the celebration of it) | Synonyms: semicentenary |
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| semicircle | (noun) a plane figure with the shape of half a circle | Synonyms: hemicycle |
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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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| 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 |
| semiconsciousness | (noun) marginal consciousness | Synonyms: grogginess, stupefaction, stupor |
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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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| semidiameter | (noun) the apparent radius of a celestial body when viewed as a disc from the earth | - |
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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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| semigloss | (noun) a paint that dries with a finish between glossy and flat | - |
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| semilegality | (noun) The property of being of partial or questionable legality. | Synonyms: semi-legality |
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| semimonthly | (noun) a periodical that is published twice each month (or 24 issues per year) | - |
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| 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 | - |
| seminoma | (noun) malignant tumor of the testis; usually occurring in older men | Synonyms: testicular cancer |
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| semiology | (noun) (philosophy) a philosophical theory of the functions of signs and symbols | Synonyms: semiotics |
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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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| 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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| semiquaver | (noun) a musical note having the time value of a sixteenth of a whole note | Synonyms: sixteenth note |
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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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| 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 | (noun) a periodical that is published twice each week (or 104 issues per year) | - |
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