What is another word for in a portion only?
Pronunciation: [ɪn ɐ pˈɔːʃən ˈə͡ʊnli] (IPA) 
There are various synonyms for the phrase "in a portion only". Some of the alternatives include "partially", "in part", "to some extent", "partly", "fractionally", and "incompletely". All these terms refer to something that is not complete, entire, or total, but rather constitutes only a part or fraction of the whole. For instance, when one says that they have read a book "in a portion only", it means they have not read the whole book, but only a specific section or chapter. Similarly, one can use any of these synonyms to convey the same meaning of partiality or incompleteness in different contexts.
