accession, accessory, accompaniment, actualization, addenda, addendum, additament, addition, additive, additory, additum, adjunct, adjuvant, annex, annexation, appanage, appendage, appendant, approximation, appurtenance, appurtenant, attachment, augment, augmentation, coda, complement, concomitant, continuation, corollary, differentiation, division, equation, evolution, extension, exteriorization, externalization, fixture, increase, increment, integration, interpolation, inversion, involution, multiplication, notation, objectification, offshoot, pendant, practice, projection, proportion, reduction, reinforcement, side effect, side issue, subtraction, supplement, tailpiece, transformation, undergirding