Kalmar “tautological” sifa ce da ke nuni ga wani abu da ba shi da yawa ko maimaituwa, sau da yawa yana bayyana abu guda sau biyu cikin kalmomi ko jimloli daban-daban. An samo ta ne daga sunan “tautology,” wato magana ko magana a cikinta ana faɗin abu iri ɗaya sau da yawa ta hanyoyi daban-daban, ba tare da ƙara wani ƙarin bayani ko haske ba. A hankali da falsafa, tautology magana ce da ta tabbata ta hanyar sigar hankali ko tsarinta. Gabaɗaya amfani, lokacin da aka kwatanta wani abu a matsayin tautological, yana nufin cewa ba dole ba ne maimaituwa ko bayyana bayyane.