natural family planning in which ovulation is assumed to occur 14 days before the onset of a period (the fertile period would be assumed to extend from day 10 through day 18 of her cycle) | (astronomy) the particular appearance of a body's state of illumination (especially one of the recurring shapes of the part of Earth's moon that is illuminated by the sun) |
recurring at regular intervals | (physical chemistry) a distinct state of matter in a system; matter that is identical in chemical composition and physical state and separated from other material by the phase boundary |
(architecture) the repetitive use of a group of visual elements to establish a recognizable pattern | any distinct time period in a sequence of events |
the arrangement of spoken words alternating stressed and unstressed elements | a particular point in the time of a cycle; measured from some arbitrary zero and expressed as an angle |
the basic rhythmic unit in a piece of music | |
an interval during which a recurring sequence of events occurs | |