conforming to a standard or pattern; "following the regular procedure of the legislature"; "a regular electrical outlet"
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punctual
acting or arriving or performed exactly at the time appointed; "she expected guests to be punctual at meals"; "he is not a particularly punctual person"; "punctual payment"
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timely
done or happening at the appropriate or proper time; "a timely warning"; "with timely treatment the patient has a good chance of recovery"; "a seasonable time for discussion"; "the book's publication was well timed"