IPA: //prɪˈmɪl.ə.ni.əl//
KK: /prɪˈmɪl.ə.ni.əl/
Relating to the period before a thousand-year reign or significant event, often used in religious contexts.
Many people believe that certain events will occur in the premillennial period before the new era begins.
Premillennial is formed from "pre-" (meaning before) and "millennium" (from Latin "mille" meaning thousand and "annus" meaning year). The term refers to the belief or doctrine that Christ will return before a thousand-year reign, hence before the millennium.
Think of 'pre-' meaning before and 'millennium' referring to a thousand years — this helps you remember that premillennial refers to events occurring before the thousand-year reign.