-\def\vcentcolon{\kern4mu:\kern3mu} mathtools
-\def\dblcolon{\vcentcolon\kern-8mu\vcentcolon} mathtools
-\def\coloneqq{\vcentcolon\kern-7mu=} mathtools
-\def\Coloneqq{\dblcolon\kern-7mu=} mathtools
-\def\coloneq{\vcentcolon\kern-7mu-} mathtools
-\def\Coloneq{\dblcolon\kern-7mu-} mathtools
-\def\eqqcolon{=\kern-8mu\vcentcolon} mathtools
-\def\Eqqcolon{=\kern-8mu\dblcolon} mathtools
-\def\eqcolon{-\kern-8mu\vcentcolon} mathtools
-\def\Eqcolon{-\kern-8mu\dblcolon} mathtools
-\def\colonapprox{\vcentcolon\kern-7mu\approx} mathtools
-\def\Colonapprox{\dblcolon\kern-7mu\approx} mathtools
-\def\colonsim{\vcentcolon\kern-7mu\sim} mathtools
-\def\Colonsim{\dblcolon\kern-7mu\sim} mathtools
+vcentcolon cmr 58 58 mathrel : mathtools
+ordinarycolon cmr 58 58 mathrel : mathtools
+\def\dblcolon{\vcentcolon\mathrel{\kern-0.9mu}\vcentcolon} mathrel :: mathtools
+\def\coloneqq{\vcentcolon\mathrel{\kern-1.2mu}=} mathrel ≔ mathtools
+\def\Coloneqq{\dblcolon\mathrel{\kern-1.2mu}=} mathrel ::= mathtools
+\def\coloneq{\vcentcolon\mathrel{\kern-1.2mu}\mathrel{-}} mathrel :- mathtools
+\def\Coloneq{\dblcolon\mathrel{\kern-1.2mu}\mathrel{-}} mathrel ::- mathtools
+\def\eqqcolon{=\mathrel{\kern-1.2mu}\vcentcolon} mathrel ≕ mathtools
+\def\Eqqcolon{=\mathrel{\kern-1.2mu}\dblcolon} mathrel =:: mathtools
+\def\eqcolon{\mathrel{-}\mathrel{\kern-1.2mu}\vcentcolon} mathrel -: mathtools
+\def\Eqcolon{\mathrel{-}\mathrel{\kern-1.2mu}\dblcolon} mathrel -:: mathtools
+\def\colonapprox{\vcentcolon\mathrel{\kern-1.2mu}\approx} mathrel :≈ mathtools
+\def\Colonapprox{\dblcolon\mathrel{\kern-1.2mu}\approx} mathrel ::≈ mathtools
+\def\colonsim{\vcentcolon\mathrel{\kern-1.2mu}\sim} mathrel :∼ mathtools
+\def\Colonsim{\dblcolon\mathrel{\kern-1.2mu}\sim} mathrel ::∼ mathtools