na-adjective
at regular intervals; evenly spaced
Describes objects, positions, or events arranged with equal distance or time between them. Often used with に as an adverb.
木を等間隔に植える。
Plant trees at regular intervals.
等間隔に点を打ってください。
Please place dots at even intervals.
Compound of 等 (equal) + 間隔 (interval).