com·mit / kəˈmit/ • v. (-mit·ted, -mit·ting) [tr.] 1. carry out or perpetrate (a mistake, crime, or immoral act).2. pledge or bind (a person or an organization) to a certain course or policy: they were reluctant to commit themselves to an opinion. ∎  pledge or set aside (resources) for future use: manufacturers will have to commit substantial funds to developing new engines. ∎  (be committed to) be in a long-term emotional relationship with (someone). ∎  (be committed to) be dedicated to (something): it is a modern Marxist party committed to democratic socialism.3. send, entrust, or consign, in particular: ∎  consign (someone) officially to prison, esp. on remand. ∎  send (a person or case) for trial. ∎  send (someone) to be confined in a psychiatric hospital. ∎  (commit something to) transfer something to (a state or place): he composed a letter but didn't commit it to paper. ∎  refer (a legislative bill) to a committee.DERIVATIVES: com·mit·ta·ble adj.com·mit·ter n.

commit
A. entrust XIV;

B. perpetrate XV;

C. engage, involve XVII. — L. committere join, join (battle), practise, perpetrate, place with another for safety, etc., entrust, f. COM- + mittere put, send (see MISSION).
Hence commitment XVII, committal XIX.