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| a number that is a multiple of all the denominators of a set of fractions |
| the second power of a quantity, expressed as a2 = a ? a, where a is the quantity |
expression ex·pres·sion (ĭk-sprěsh'ən)
n.
The act of pressing or squeezing out.
The outward manifestation of a mood or disposition by mobility of the facial features; facies.
The phenotype manifested by a genotype under fixed environmental conditions.