WordNet

a unit of geological time during which a system of rocks formed; "ganoid fishes swarmed during the earlier geological periods" (同)geological period
(ice hockey) one of three divisions into which play is divided in hockey games
the end or completion of something; "death put a period to his endeavors"; "a change soon put a period to my tranquility"
the interval taken to complete one cycle of a regularly repeating phenomenon
a punctuation mark (.) placed at the end of a declarative sentence to indicate a full stop or after abbreviations; "in England they call a period a stop" (同)point, full_stop, stop, full point
happening or recurring at regular intervals; "the periodic appearance of the seventeen-year locust" (同)periodical
recurring or reappearing from time to time; "periodic feelings of anxiety" (同)occasional

PrepTutorEJDIC

(あることが続く)『期間』 / (歴史的な)『時代』 / (試合の)『一区切り』,ピリオド / 授業時間,時限: / (循環して起こる現象などの)周期 / (回転運動などの)周期 / 紀(地質時代の区分の一つ;era(代)の下,epoch(世)の上) / 《おもに米》『ピリオド』,終止符(《英》full stop;Mr.,U.S.など略語の符号(.)も含む) / 《複数形で》《文》掉尾(とうび)文(多くの節から成り,論理的に緊密な構成をもっている文) / 《名詞の前にのみ用いて》ある時代[特有]の,時代物の / (文の終わりに感嘆詞的に)以上,終わり・月経（期間）
定期的な,周期的な / ときぎき起こる: / 掉尾(とうび)的の:

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Satoh M, Yoshihara T.SourceDepartment of Otolaryngology, School of Medicine, Tokyo Women's Medical University, Japan.
Acta oto-laryngologica. Supplementum.Acta Otolaryngol Suppl.2004 Aug;(553):122-7.
OBJECTIVE: The records of 65 patients with sialadenosis treated between 1989 and 2002 at Tokyo Women's Medical University Hospital were studied clinically and ultracytochemically, focusing on the secretory granules of the acinar cells.MATERIAL AND METHODS: Biopsies of parotid glands were performed i
PMID 15277051