This is the 1384th most frequent Japanese word.
偶然
Coincidence; by chance.
In this sentence, “偶然” refers to an unplanned or unexpected occurrence of meeting someone.
公園で偶然友人に会いました。
I met a friend at the park by coincidence.
“偶然” is used here to describe an incidental acquisition of knowledge or information.
偶然そのイベントの詳細を知りました。
I learned the details of the event by chance.
Here, “偶然にも” emphasizes the surprising or noteworthy aspect of the coincidence.