IPA: /ˌprɛtəˈmɪʃən/
KK: /prɛtəˈmɪʃən/
The act of leaving something out or not including it.
The pretermission of certain details in the report led to confusion among the team members.
Pretermission is formed from "praeter-" (meaning beyond or past) and "mittere" (meaning to send). The word refers to the act of sending something beyond or neglecting to mention it, thus implying omission or neglect.
Think of 'beyond' ('praeter-') and 'sending' ('mittere') to remember that 'pretermission' means to send something beyond or to omit it.