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A1 abbreviation of "answer."
a1 the first letter of the English alphabet. [6 definitions]
a2 any one of a group or kind. [3 definitions]
a3 in every or in each; for every or for each.
As symbol of the chemical element arsenic.
as1 equally; to the same extent or degree. [11 definitions]
as2 an ancient Roman unit of weight equal to approximately twelve ounces; libra. [2 definitions]
as- to.