next autumn; next fall
Used as a noun or adverb to refer to the coming autumn season. Common in schedules, plans, and seasonal references.
I plan to study abroad next autumn.
来秋の学会で発表します。
I will present at the conference next fall.
今秋 means 'this autumn' (the current year's autumn), while 来秋 means 'next autumn'.
昨秋 points to last autumn, whereas 来秋 points to next autumn.
Compound of 来 (rai, 'next, coming') and 秋 (shū, 'autumn'). The reading らいしゅう follows standard on'yomi.