(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) | the act of producing offspring or multiplying by such production |
(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 | the production of heat or electricity |
any distinct time period in a sequence of events | a coming into being |
a particular point in the time of a cycle; measured from some arbitrary zero and expressed as an angle | group of genetically related organisms constituting a single step in the line of descent |
| all the people living at the same time or of approximately the same age |
| the normal time between successive generations |
| a stage of technological development or innovation |