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periodic comet
(astronomy) A comet which orbits the Sun and which returns to the innermost point of its orbit at known, regular intervals.
periodic sentence
(rhetoric) A sentence whose main clause appears at its end.
periodic tables
plural of periodic table
rotational period
(of an astronomic object) The time taken to rotate about its axis relative to the background stars.
rotation period
menstruation period
Alternative form of menstrual period
question period
Alternative form of Question Period
notice period
Time period between the receipt of the letter of dismissal and the last working day.
accounting period
A regular period of time, as a month, quarter, or year, for which an operative statement is drawn up.
Third Period
(communism, history) According to an obsolete theory, a period shortly after the Great Depression in which capitalism would be marked by further crises and then soon collapse.