o ‧ a ‧ sis /əʊˈeɪsəs, əʊˈeɪsɪs $ oʊ-/ BrE AmE noun ( plural oases /siːz/) [countable]
[ Date: 1600-1700 ; Language: Late Latin ; Origin: Greek ]
1 . a place with water and trees in a desert
2 . a peaceful or pleasant place that is very different from everything around it SYN haven
an oasis of calm/serenity/tranquillity etc
The park was an oasis of peace.