Full Idea
Tarski preferred a definition of truth, but from that an axiomatisation can be extracted. His induction clauses can be turned into axioms. Hence he opened the way to axiomatic theories of truth.
Gist of Idea
Tarski defined truth, but an axiomatisation can be extracted from his inductive clauses
Source
report of Alfred Tarski (The Concept of Truth for Formalized Languages [1933]) by Volker Halbach - Axiomatic Theories of Truth 3
Book Reference
Halbach,Volker: 'Axiomatic Theories of Truth' [CUP 2011], p.23