to mark a direct object / particle indicating the object of an action

(obsolete except as a particle) The hiragana syllable を (o). Its equivalent in katakana is ヲ (o). It is the forty-seventh syllable in the gojūon order; its position is わ行お段 (wa-gyō o-dan, “row wa, section o”).

(with transitive verb) An accusative case particle: a grammatical marker following the direct object of a verb. / (with intransitive verb) away from, off

(Classical Japanese or archaic) Emphatic form of the object marker を (o).

(literary) を (o, the accusative case particle) + も (mo, “also; as well”). Even x (acc).

a female given name

(archaic, literary, formal) indicates the patient of a causative expression; used with the auxiliary verb しめる (shimeru) to mark the causative

If X, then it would not have been Y

through, by way of, after

the condition of a vanishment being into thin air