الدلالة الالتزامية، وهي أن لا يدل اللفظ على الموضوع له ولا على جزئه، بل على معنى خارج لازم للموضوع له
Iltizām occurs when a word signifies neither its whole assigned meaning nor a component, but an external necessary concomitant.
The word lāzim is crucial. The intended feature is not included within the definition, yet grasping the assigned meaning leads the mind to something necessarily associated with it.
For example, understanding “four” brings evenness to mind. Evenness is not the word's complete assigned meaning or merely a definitional component, but a necessary property of the number.