| calibration | (noun) the act of checking or adjusting (by comparison with a standard) the accuracy of a measuring instrument | Synonyms: standardisation, standardization |
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| calibre | (noun) a degree or grade of excellence or worth | Synonyms: caliber, quality |
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| (noun) diameter of a tube or gun barrel | Synonyms: bore, caliber, gauge |
| disequilibrium | (noun) loss of equilibrium attributable to an unstable situation in which some forces outweigh others | - |
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| equilibration | (noun) stabilization by bringing into equilibrium | - |
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| equilibrium | (noun) a sensory system located in structures of the inner ear that registers the orientation of the head | Synonyms: labyrinthine sense, sense of balance, sense of equilibrium, vestibular sense |
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| (noun) a chemical reaction and its reverse proceed at equal rates | Synonyms: chemical equilibrium |
| (noun) equality of distribution | Synonyms: balance, counterbalance, equipoise |
| (noun) a stable situation in which forces cancel one another | - |
| lamellibranch | (noun) marine or freshwater mollusks having a soft body with platelike gills enclosed within two shells hinged together | Synonyms: bivalve, pelecypod |
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| librarian | (noun) a professional person trained in library science and engaged in library services | Synonyms: bibliothec |
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| librarianship | (noun) the position of librarian | - |
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| library | (noun) a depository built to contain books and other materials for reading and study | Synonyms: depository library |
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| (noun) a room where books are kept | - |
| (noun) a building that houses a collection of books and other materials | - |
| (noun) a collection of literary documents or records kept for reference or borrowing | - |
| (noun) (computing) a collection of standard programs and subroutines that are stored and available for immediate use | Synonyms: program library, subroutine library |
| libration | (noun) (astronomy) a real or apparent slow oscillation of a moon or satellite | - |
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| librettist | (noun) author of words to be set to music in an opera or operetta | - |
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| libretto | (noun) the words of an opera or musical play | - |
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