regular

• adj.規則正しい；正規の；資格のある；きちんとした；普通の
• n. レギュラーの; レギュラーチームのメンバー; 頑健な
• adv.規則正しく; 定期的に
• n.(規則的な)人名；(レギュラーとして)レギュラー

ラテン語のregula「規則」から、regere「統治する」「支配する」から、PIE*reg「まっすぐにする」から。

regular

regular: [14] Regular ‘according to a rule’ is the most instantly recognizable English descendant of Latin rēgula ‘rule’ (others include rail ‘bar’ and rule). It goes back ultimately to the same Indo-European base as produced Latin regere ‘rule’ (source of English rector, regent, etc) and rēx ‘king’ (source of English regal, royal, etc). From it was derived the late Latin verb rēgulāre, which has given English regulate [17], and may also lie behind rile ‘annoy’ [19], a variant of an earlier roil which was possibly imported via Old French ruiler ‘mix mortar’.
=> rector, regent, regulate, rile, rule

regular (adj.)

late 14c., from Old French reguler "ecclesiastical" (Modern French régulier), from Late Latin regularis "containing rules for guidance," from Latin regula "rule," from PIE *reg- "move in a straight line" (see regal).

Earliest sense was of religious orders (the opposite of secular). Extended from late 16c. to shapes, etc., that followed predictable or uniform patterns; sense of "normal" is from 1630s; meaning "real, genuine" is from 1821. Old English borrowed Latin regula and nativized it as regol "rule, regulation, canon, law, standard, pattern;" hence regolsticca "ruler" (instrument); regollic (adj.) "canonical, regular."

regular (n.)

c. 1400, "member of a religious order," from regular (adj.). Sense of "soldier of a standing army" is from 1756. Meaning "regular customer" is from 1852; meaning "leaded gasoline" is from 1978.

1. Check the oil at regular intervals，and have the car serviced regularly.

定期的にガソリンを検査し、車両を定期的にメンテナンスする。

2.He is being constantly monitored with regular checks on his blood pressure.

彼はリアルタイムで監視され、血圧を計時した。

3.George struggled wildly，going under and resurfacing at regular intervals.

ジョージは狂ったようにもがいて、水面に浮き沈みし続けた。

4.She also writes a regular column for the Times Educational Supplement.

彼女も定期的にタイムズ高等教育増刊のためにコラムを書いている。

5.Make a point of backing up your files at regular intervals.

は定期的にファイルをバックアップしなければなりません。