Having value or meaning; worthwhile or significant. Often used in somewhat formal contexts.
今日はとても有意義な会議だった。
Today was a very meaningful/productive meeting.
海外でのボランティア活動は私にとって有意義な経験だった。
Volunteering abroad was a meaningful experience for me.
限られた時間を有意義に使いたい。
I want to use my limited time meaningfully.