To change into another substance having the same atomic proportions, but a higher molecular weight; to undergo polymerization; thus, aldehyde polymerizes in forming paraldehyde
To change, by union of two or more molecules of the same kind, into another compound having the same elements in the same proportions, but a higher molecular weight and different physical properties
To cause polymerization of; to produce polymers from; to increase the molecular weight of, without changing the atomic proportions; thus, certain acids polymerize aldehyde