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Word of Random

random[random 词源字典]

random: [14] The antecedents of random are somewhat murky. It originally meant ‘impetuosity, sudden speed, violence’, and only in the mid 17th century emerged as an adjective meaning ‘haphazard’. It was borrowed from Old French randon, which was probably a derivative of the verb randir ‘run impetuously’. This in turn was based on Frankish *rant ‘running’, which was apparently descended from prehistoric Germanic *randa.

This originally meant ‘edge’ (it is the source of English rand [OE], now obsolete as a term for ‘edge’, but reintroduced in the 20th century via Afrikaans as the name of the basic South African currency unit), but it was also widely used for ‘shield’, and it is thought that the link with ‘running impetuously’ may be the notion of soldiers running along with their shields.
=> rand[random etymology, random origin, 英语词源]