Science / Biology / Absolute Time: One of the two types of geologic time (relative time being the other), with a definite age date established mostly by the decay of radioactive elements, although ages may also be obtained by counting tree rings, decay of a specific type of atom, or annual sedimentary layers (such as varves in lakes or layers in a glacier). The term is in some disfavor because it suggests an exactness that may not be possible to obtain.
Absolute Adjective Synonyms: perfect, complete, total, finished, thorough, through-and-through, consummate, flawless, faultless, unadulterated, pure, unmixed, unalloyed, undiluted, rank
Science / Biology / Radiometric Time: Type of absolute time determined by the relative porportions of radioisotopes to stable daughter isotopes. MORE
Science / Biology / Relative Time: Type of geologic time (absolute time being the other) that places events in a sequence relative to each other. MORE