noun [ C usually plural ] uk / ɪˈnɪʃ. ə l / us / ɪˈnɪʃ. ə l / B1. the first letter of a name, especially when used to represent the whole name: your initials He wrote his initials, P.M.R., at the bottom of the page. initial stands for Paul M. Reynolds refused to say what the initial "M" stood for. More @Wikipedia
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