AA
From Sealing Technology & Engineering Glossary
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| Name | AA |
| Definition | Mathematical term used to measure the sum of a series of numbers divided by the number of terms in the series. E.g., AA of the following number: 6, 12, 4, and 15 is (6+12+4+15)/4 = 9.25. AA is sometimes used in surface finish literature where it has the s. |
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