Meaning

noun person's predisposition to be affected by something (as a disease)

noun constitution of the human body

originFrom Latin habitus (“habit”), from habeō (“have; maintain”). The plural habiti is a misconstruction, as the Latin plural is in fact habitūs. habiti may have been influenced by Latin habitī, the plural of the participle habitus; however, it is not the etymon of the English term.

Etymology from Wiktionary, CC BY-SA 3.0