Apa itu affix? Apa itu affix? To secure to something; attach: affix a label to a package. To impute; attribute: affix blame to him. To place at the end; append: affix a postscript to a letter. Grammar To add as an affix.Something that is attached, joined, or added; an appendage or addition.Linguistics A word element, such as a prefix or suffix, that can only occur attached to a base, stem, or root.