prefix
Prefix used in formal or written contexts to refer to the present instance of a period, event, or thing. Common in compounds like 今世紀 (this century), 今シーズン (this season), 今国会 (the current Diet session).
今世紀最大の発見と言われている。
It is said to be the greatest discovery of this century.
今シーズンの目標は優勝です。
Our goal for this season is to win the championship.
prefix
today's
Prefix used in formal or written contexts to refer to today's instance of something. Common in compounds like 今朝 (this morning) and 今夕 (this evening), though those are often read with kun'yomi. The こん reading appears in more formal or technical compounds like 今暁 (this dawn) or 今般 (this time/recently).
今般の決定についてご報告申し上げます。
I would like to report on the recent decision.
今暁の気温は氷点下まで下がった。
The temperature dropped below freezing this dawn.