1611, from M.L. incapacitas, from L.L. incapax (gen. incapacis) "incapable," from in- "not" + L. capax "capable," lit. "able to hold much," from capere "to take" (see capable). Often used 17c. as a legal term referring to inability to take, receive, or deal with in some way.
Main Entry: in·ca·pac·i·ty Pronunciation: "in-k&-'pa-s&-tE Function: noun Inflected Form: plural-ties 1: the quality or state of being incapable; especially: lack of legal qualifications due to age or mental condition —compare CAPACITY 2: the inability of an injured worker to perform the duties required in a job for which he or she is qualified —compare DISABILITY 1
[in-kuh-pas-i-tee] 
kəˈpæs