سواء كان اللازم داخلا كما في التضمن أو خارجا كما في الالتزام
Whether the connected meaning lies within the assigned sense, as in inclusion, or outside it, as in implication.
Here lāzim is used broadly: it is not restricted to an externally related concomitant. An internal component, considered under taḍammun, may also be involved in the general account, while iltizām concerns an external connected sense.
A composite expression can lead attention to one of its included components. Conversely, “long sword-strap” can lead from its literal content to the external, associated quality of tall stature. In either case we must first specify the relation between the primary and intended meanings.