noun
main purpose; primary objective
Straightforward compound meaning the most important goal or aim. Used in both formal and everyday contexts.
この会議の主目的は、来年度の予算を決めることです。
The main purpose of this meeting is to decide next year's budget.
彼の主目的は、ただ楽しむことだった。
His primary objective was simply to have fun.
主眼 also means 'main point' or 'focus', but is slightly more formal and often used in discussions of policy or argumentation.
Compound of 主 (しゅ, 'main') and 目的 (もくてき, 'purpose'). The reading follows standard on'yomi.