(frequency) One and only one time. / (temporal location) Formerly; during some period in the past. / (obsolete) At any time; ever. / (obsolete) One day, someday.

As soon as; when; after.

(obsolete) In one group; together. / At the same time; simultaneously. / Immediately; now; right away.

(idiomatic) For the first time, after many instances to the contrary; in a rare exception to the rule; as an exception to the usual.

The state or condition of being once; singularity.

Alternative form of oncet (“once”).

(medicine, colloquial) Oncology.

(medicine, colloquial) Oncological.

(UK, education) Initialism of Ordinary National Certificate.

plural of ONC