Tatmīm contributes a useful supplement without necessarily correcting a dangerous misunderstanding. It may involve an additional attribute, phrase, qualification, or other meaningful detail. The specific definition of iʿtirāḍ concerns one or more non-governed clauses.
Thus tatmīm can occur in material smaller than a clause, which falls outside that narrow definition of parenthesis. Under a broader terminology, some clausal forms of tatmīm may overlap with iʿtirāḍ, but their purposes should still be identified separately.