lifespan

the word 'lifespan' is a transparent compound formed from two ancient germanic roots. 'life' descends from the proto-germanic 'lībą', which carried the core sense of "life, body," and is ultimately from the pie root 'leip-', meaning "to stick, adhere," with a semantic evolution towards the vital force that clings to the body. 'span' originates from proto-germanic 'spannō', referring to a measured stretch, and is related to the pie root 'spen-', meaning "to draw, stretch, spin." the compound logically marries these concepts: the 'stretch' or 'extent' ('span') of one's 'life'. it first appeared in english in the early 20th century, providing a concise, measurable term for the duration of existence, applicable to both biological organisms and the functional period of objects or ideas.

Structure: life (living) + span (duration) life: from old english 'līf', of germanic origin; related to dutch 'lijf' and german 'leib'. it functions as the core noun denoting the condition of being alive. span: from old english 'spann', originally meaning the distance from the tip of the thumb to the tip of the little finger when the hand is spread out. it is of germanic origin and functions as a noun denoting a limited extent, duration, or distance.