[ 'lɒgərɪδ(ə)m , -rɪθ- ]
■ noun a quantity representing the power to which a fixed number (the base) must be raised to produce a given number.
Derivatives
~ic adjective
~ically adverb
Origin
C17: from mod. L. ~us , from Gk logos 'reckoning, ratio' + arithmos 'number'.