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| speech addressed to a public assembly |
| difficult to fathom or understand |
pI (pē'ī')
n.
The pH value for the isoelectric point of a given substance in solution.
| pi (pī) Pronunciation Key
An irrational number that has a numerical value of 3.14159265358979... and is represented by the symbol π. It expresses the ratio of the circumference to the diameter of a circle and appears in many mathematical expressions. |
The irrational number obtained by dividing the length of the diameter of a circle into its circumference. Pi is approximately 3.1416. The sign for pi is π.