Done at the proper time or within the proper time limits; prompt. / Happening or appearing at the proper time. / (obsolete) Keeping time or measure.

(archaic) In good time; early, quickly. / (obsolete) At the right time; seasonably. / (law) In compliance with applicable time limits.

from time to time

On or near the same date (in the past or in the future). / On this occasion (as opposed to last time or next time).

plural of timing

Never.

It was once true (that)...; there was a time when...

When (some future event has come to pass).

(idiomatic) On occasion, sometimes.

(informal, arithmetic) To multiply.