A cikin ilimin lissafi, tazara mai iyaka shine saitin lambobi na gaske waɗanda suka haɗa da dukkan lambobi tsakanin ƙayyadaddun maki biyu na ƙarshe, waɗanda ƙila su kasance mai haɗawa ko keɓantacce.Misali, tazarar [a, b] ya ƙunshi duk ainihin lambobi x kamar ≤ x ≤ b, yayin da tazara (a, b) ta ƙunshi duk ainihin lambobi x kamar a
