| aperiodic | (adjective) not recurring at regular intervals | Synonyms: nonperiodic |
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| nonperiodic | (adjective) not recurring at regular intervals | Synonyms: aperiodic |
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| period | (noun) a punctuation mark (.) placed at the end of a declarative sentence to indicate a full stop or after abbreviations | Synonyms: full point, full stop, point, stop |
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| (noun) the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause | Synonyms: catamenia, flow, menses, menstruation, menstruum |
| (noun) an amount of time | Synonyms: period of time, time period |
| (noun) the interval taken to complete one cycle of a regularly repeating phenomenon | - |
| (noun) a unit of geological time during which a system of rocks formed | Synonyms: geological period |
| (noun) the end or completion of something | - |
| (noun) (ice hockey) one of three divisions into which play is divided in hockey games | - |
| periodic | (adjective) happening or recurring at regular intervals | Synonyms: periodical |
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| (adjective) recurring or reappearing from time to time | Synonyms: occasional |
| periodical | (adjective) happening or recurring at regular intervals | Synonyms: periodic |
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| (noun) a publication that appears at fixed intervals | - |
| periodically | (adverb) in a sporadic manner | Synonyms: sporadically |
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| periodicity | (noun) the quality of recurring at regular intervals | Synonyms: cyclicity |
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| periodontal | (adjective) of or relating to or involving or practicing periodontics | Synonyms: periodontic |
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| periodontia | (noun) the branch of dentistry dealing with diseases of the gums and other structures around the teeth | Synonyms: periodontics |
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| periodontic | (adjective) of or relating to or involving or practicing periodontics | Synonyms: periodontal |
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| periodontics | (noun) the branch of dentistry dealing with diseases of the gums and other structures around the teeth | Synonyms: periodontia |
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| periodontist | (noun) a dentist specializing in diseases of the gums and other structure surrounding the teeth | - |
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| periodontitis | (noun) a disease that attacks the gum and bone and around the teeth | Synonyms: periodontal disease |
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| triode | (noun) a thermionic vacuum tube having three electrodes; fluctuations of the charge on the grid control the flow from cathode to anode which makes amplification possible | - |
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