multicellular organism development http://purl.obolibrary.org/obo/GO_0007275 https://www.wikidata.org/wiki/Q14645705 The biological process whose specific outcome is the progression of a multicellular organism over time from an initial condition (e.g. a zygote or a young adult) to a later condition (e.g. a multicellular animal or an aged adult). anatomical structure development