The word "pro-portioning" can be defined as the act of dividing something into parts or portions. Antonyms for this word could include "combining," "uniting," or "merging," which refer to the act of bringing together separate elements to create a whole. Another antonym could be "condensing," which refers to the act of reducing something in size or quantity. Alternatively, antonyms for the word could include "disordering," "jumbling," or "scattering," which refer to the opposite of dividing something into parts - instead, these words suggest that something is being mixed up or separated into disorganized pieces.