authoritativeadj USA: ʌ·θɔː'rʌ·teɪ"tɪ·v UK: ɔːθɔrɪtətɪv
authoritativelyadv USA: ʌ·θɔː"rʌ·teɪ'tɪ·vliː· UK: ɔːθɔrɪtətɪvliː
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