tranniversary UK /ˌtɹænɪˈvɜːs(ə)ɹi/US /ˌtɹænɪˈvɝs(ə)ɹi/ noun2 •(informal) The anniversary of coming out as transgender or of transitioning.throwaways thrives traniversary transabled troubles turmoil threats — 2017 •(informal, rare) The anniversary of getting an organ transplant. formstranniversaries