الْمُتَوَحِّدِ
The One characterized by uniqueness.
Mutawaḥḥid is an active participle of form tafaʿʿul, from the root w-ḥ-d. This verbal form can in different contexts suggest seeking, adopting, or entering a condition. Such tendencies are not automatic meanings of every derived form.
When applied to Allah, the word cannot mean that He previously lacked oneness and later acquired it through effort. Divine uniqueness is eternal. Linguistic explanation must therefore remain compatible with transcendence.
Contrast: A human may choose to separate from others, which is a new action. God's unity is not produced by an acquired change. Morphology informs meaning, but sound theological usage determines which senses are appropriate here.