Ma'anar ƙamus na daidaita daidaito yana nufin al'amari inda jerin lambobi ko maki ke zama iri ɗaya a rarraba akan wani yanki ko yanki. A cikin ilmin lissafi, dukiya ce ta jeri wacce ke da iyakataccen rarraba yiwuwar rarrabawa, kamar yadda yawan faruwar kowane nau'i a cikin jeri yana fuskantar ƙima akai-akai yayin da jerin ke zama tsayi mara iyaka. Wannan ra'ayi yana da aikace-aikace a fannoni kamar ka'idar lamba, ka'idar yiwuwar, da ƙididdiga.