WordNet sense 1 (a new word formed by joining two others and combining their meanings):

portmanteau, portmanteau word

WordNet sense 2 (blend or harmonize):

go, blend in

WordNet sense 3 (combine into one):

intermingle, intermix, immingle

WordNet sense 4 (mix together different elements):

coalesce, combine, commingle, conflate, flux, fuse, meld, merge, mix, immix, combine

WordNet sense 5 (the act of blending components together thoroughly):

blending