### logarithm

• n. [数] 对数 «
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logarithm
logarithm:  Greek lógos had a remarkably wide spread of meanings, ranging from ‘speech, saying’ to ‘reason, reckoning, calculation’, and ‘ratio’. The more ‘verbal’ end of its spectrum has given English the suffixes -logue and -logy (as in dialogue, tautology, etc), while the ‘reasoning’ component has contributed logic  (from the Greek derivative logiké), logistic  (from the Greek derivative logistikós ‘of calculation’), and logarithm, coined in the early 17th century by the English mathematician John Napier from Greek logós ‘ratio’ and arithmós ‘number’ (source of English arithmetic ).
logarithm (n.)
1610s, Modern Latin logarithmus, coined by Scottish mathematician John Napier (1550-1617), literally "ratio-number," from Greek logos "proportion, ratio, word" (see logos) + arithmos "number" (see arithmetic).
1. The natural logarithm of this ratio is called the logarithmic decrement.

2. The characteristic of the logarithm 6.3214 is 6.

3. His first designs were for a machine to calculate such things as logarithm tables.

4. Returns the logarithm of a specified number in a specified base.

5. The fifth day is the logarithm stage for the mycelium growth.