| period | happening or recurring at regular intervals |
|---|---|
| period | recurring at regular intervals |
| period | any oxygen-containing acid of iodine |
| period | irregular breathing of newborns |
| period | abnormal respiration in which periods of shallow and deep breathing alternate |
| period | an event that recurs at intervals |
| period | (chemistry) the principle that chemical properties of the elements are periodic functions of their atomic numbers |
| period | a complex sentence in which the main clause comes last and is preceded by the subordinate clause |
| period | a tabular arrangement of the chemical elements according to atomic number as based on the periodic law |
| period | a publication that appears at fixed intervals |
| period | happening or recurring at regular intervals |
| period | North American cicada |