Language is often regarded as a defining trait of our species, but what are its core properties? In 1960, Hockett published ‘The origin of speech’ enumerating 13 design features presumed to be common to all languages, and which, taken together, separate language from other communication systems. Here. we review which features still hold true in light of new evidence from cognitive science, linguistics, animal cognition, and anthropology, and demonstrate how a revised understanding of language highlights three core aspects: that language is inherently multimodal and semiotically diverse; that it functions as a tool for semantic, pragmatic, and social inference, as well as facilitating categorization; and that the processes of interaction and transmission give rise to central design features of language.