at regular intervals

At an equal distance apart. Make sure to position those Christmas lights so that the flashing ones appear at regular intervals.

at regular intervals

[of things in a series] at points that are equally distant from each other. You will find service stations at regular intervals along the highway. There are street lights at regular intervals on the main street of town.

Common Names:

Name	Pronounced	Usage
Caratacus	-	Ancient Celtic (Latinized)
Narayanan	-	Indian, Malayalam, Tamil
Matthias	mah-TEE-ahs (German), mə-THIE-əs (English)	Greek, German, Swedish, Norwegian, Danish, French, Dutch, Biblical, Biblical Latin, Biblical Greek
Felicidade	-	Portuguese
Mariana	mə-RYA-nə (Portuguese), mah-RYAH-nah (Spanish)	Portuguese, Spanish, Romanian, Czech, Ancient Roman
Bendiks	-	Latvian