the 1st letter of the English alphabet. a graphic representation of this letter. a speech counterpart of orthographic a. the sixth tone of a C-major scale. a graphic device for reproducing the letter a. one designated a especially as the first in order or class. a grade rating a student's work as superior in quality. one graded or rated with an A. something shaped like the letter A. the one of the four ABO blood groups characterized by the presence of antigens designated by the letter A and by the presence of antibodies against the antigens present in the B blood group. used as a function word before singular nouns when the referent is unspecified and before number collectives and some numbers. the same. used as a function word before a singular noun followed by a restrictive modifier. ANY. used as a function word before a mass noun to denote a particular type or instance. used as a function word before a proper noun representing an example or type. used as a function word before a proper noun to indicate limited knowledge about the referent. used as a function word before a proper noun to distinguish the condition of the referent from a usual, former, or hypothetical condition. used before the name of a day of the week to refer to one occurrence of it. used before the name of a person (such as a famous artist) when the name is being used to refer to something (such as a painting) created by that person. used before a family name to show that someone is a member of that family. used as a function word with nouns to form adverbial phrases of quantity, amount, or degree. in, to, or for each. ON, IN, AT. OF. HAVE. absent. acceleration. acre. adult. alto. amorphous —usually used in combination. anode. answer. ante. anterior. are. area. atto-. author. on: in: at. in (such) a state or condition. in (such) a manner. in the act or process of. not: without. replacing carbon especially in a ring. OXIDE. ace. adenine. ampere. argon. angstrom.