From Middle French ostenter ("to make an ostentatious display of"), or directly from its etymon Latin ostentāre, present active infinitive of ostentō, frequentative of ostendō, from ob- + tendō (from Proto-Indo-European *tend- ("to extend, stretch")).
From Latin ostentus ("a display, exhibition, show"), from ostendere, present active infinitive of ostendō; see further at etymology 1.
From Middle French ostente ("amazing or marvellous thing; prodigy, wonder") or directly from its etymon Latin ostentum ("portent"), from ostendere, present active infinitive of ostendō; see further at etymology 1.
The plural form ostenta is from Latin ostenta.
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