Every term; term by term; at fixed intervals.

figurative; esp. of time: Revolution, round. †by circuit: at regularly recurring times (obsolete).

at times, now and then.

At regularly recurring or definite intervals. Now chiefly Science.

As a regular practice (according to fixed times); at regular intervals; (hence) frequently, consistently. Now chiefly U.S. (somewhat rare).

At fixed times or uniform intervals; repeatedly, without interruption; frequently, often.

In a regular manner; on a regular basis.

(a) adv. in the manner of clockwork; with mechanical regularity; (b) adj. resembling clockwork or the motion of clockwork; that happens regularly…