trip ‧ li ‧ cate /ˈtrɪpləkət, ˈtrɪplɪkət/ BrE AmE noun
[ Date: 1400-1500 ; Language: Latin ; Origin: past participle of triplicare 'to triple' , from triplex ; ⇨ ↑ triplex ]
in triplicate if a document is in triplicate, there are three copies of it ⇨ duplicate :
Is it really necessary to complete the forms in triplicate?