the latitude of the point that is midway between two parallels on the same side of the equator.
noun, Psycholinguistics. 1. the mean number of morphemes produced per sentence, used especially as a measure of child language development. Abbreviation: MLU.
- Mean lethal dose
noun 1. another term for median lethal dose
noun, Physics. 1. the average time that an unstable particle or nucleus survives before it decays. 2. . noun 1. (physics) the average time of existence of an unstable or reactive entity, such as a nucleus, elementary particle, charge carrier, etc; lifetime. It is equal to the half-life divided by 0.693 15 τ
noun, Printing. 1. an imaginary x-high line.