To take pleasure in or enjoy an activity, experience, or thing (e.g., an event, hobby, meal).
休日は家族と公園で遊んで楽しむ。
On my days off I play in the park with my family and enjoy myself.
彼女は旅行先で地元の料理を味わいながら旅を楽しんだ。
She enjoyed the trip, tasting local dishes at each destination.
音楽を聴くのが好きで、コンサートでは心から楽しむ。
I like listening to music and truly enjoy myself at concerts.
子どもたちは公演を見て大いに楽しんでいた。
The children were greatly enjoying the performance.
To look forward to something (dated or literary usage).
手紙の最後に『再会の日を楽しむ』と書かれていた。
At the end of the letter it said, 'I look forward to the day we meet again.'
昔の日記には来る春を楽しむ気持ちがつづられている。
An old diary describes a feeling of looking forward to the coming spring.