Two issues arise in defining iʿtirāḍ: must it always stand between two connected expressions? And must the insertion itself be a full clause? Some analyses restrict the category to particular positions and clausal insertions; others also recognize certain final or non-clausal additions.
These are not merely verbal differences. A broader definition changes which examples overlap with tadhyīl or tatmīm. Classification therefore requires identifying the technical boundaries being adopted, not simply noting that something extra has been said.