Etymology
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soffit (n.)

architectural term referring to under-faces, 1610s, from Italian soffita, fem. of soffitto "ceiling," noun use of adjective meaning "fixed beneath," from Vulgar Latin *suffictus "fastened below," from Latin suffixus (see suffix (n.)).

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Definitions of soffit

soffit (n.)
the underside of a part of a building (such as an arch or overhang or beam etc.);
From wordnet.princeton.edu