Intensive Outpatient Treatment (also known as IOP for Intensive Outpatient Program) is a primary treatment program recommended in some circumstances by a clinical and medical assessment. IOP may be recommended for those who do not need medically-supervised detox.
The genitive is the case (or function) of an inflected form of a noun or pronoun showing ownership, measurement, association, or source. Adjective: genitival. The suffix -'s on nouns is a marker of genitive case in English. Genitive case can also be indicated by an of phrase after a noun.
A verbal is a word formed from a verb but functioning as a different part of speech. An infinitive is a verbal formed by placing to in front of the simple present form of a verb. Examples: to swim to think to read to be to cut to turn. Infinitives may function as adjectives, adverbs, or nouns.