n. Greediness; strong appetite: applied to the senses.n. Eagerness; intenseness of desire: applied to the mind.n. Synonyms Earnestness, Zeal, etc. See eagerness.n. In physical chemistry, a constant by means of which can be expressed the distribution of a base between two acids each sufficient to neutralize the whole of the base, or conversely; that is, the relative energy with which the acids tend to seize their shares of base: a term employed to avoid the use of the word affinity.