of an

Phrase

dated idiomatic

Japanese Meaning

(今は古い表現) 同一のものを有する、すなわち同じものを持っている / (慣用的な表現、現代ではほとんど使われない) 指定された一日の時間帯に、ある程度習慣的な行動をしていることを示す

Despite their different backgrounds, they were of an opinion on the matter.

出自は異なっていたが、その件について彼らは同じ意見だった。

Sense（1）

(now dated) Having the same.

The two main players were roughly of an age.

Sense（2）

(idiomatic, now dated) Indicates a more or less habitual activity during the given part of the day.

Of an evening, I like to play chess. i.e., On some evenings, I like to play chess.