course of dealing

nature of the conduct or previous transactions between two parties. The course of dealing evidence can provide a basis for a common understanding between the parties concerning the nature of their relationship or contractual duties with respect to another transaction.

See U.C.C. § 1-303(b) A “course of dealing” is a sequence of conduct concerning previous transactions between the parties to a particular transaction that is fairly regarded as establishing a common basis of understanding for interpreting their expressions and other conduct.

Compare Course of performance.