A symbol for the degree of acidity or alkalinity that is a scale from 0 – 14 that measures acid-to-alkaline balance – a pH of 7 is neutral, lower numbers indicate increasing acidity, and higher numbers increasing alkalinity.
Merriam-Webster Online Dictionary
pH (noun) a measure of acidity and alkalinity of a solution that is a number on a scale on which a value of 7 represents neutrality and lower numbers indicate increasing acidity and higher numbers increasing alkalinity and on which each unit of change represents a tenfold change in acidity or alkalinity and that is the negative logarithm of the effective hydrogen-ion concentration or hydrogen-ion activity in gram equivalents per liter of the solution , also the condition represented by a pH number
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Acidity level, alkalinity measure, hydrogen ion concentration, potential of hydrogen, acid-base balance