tri·plex (trĭplĕks′, trīplĕks′)
1. Composed of three parts; threefold; triple.
2. Having three apartments, divisions, or floors: a triplex apartment building; a triplex cinema.
Something, such as an apartment building, that is triplex: We live in a triplex.
[Latin; see trei- in the Appendix of Indo-European roots.]
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