Noun
(photography) A photographic format of 4 × 5 inches (102 × 127 mm) or larger.
(wine) A bottle size larger than the standard 750 mL.
Used other than figuratively or idiomatically: see large, format.
Source: en.wiktionary.orgLarge format SLR cameras were probably first marketed with the introduction of C.R. Smith's Monocular Duplex (U. Source: Internet
Large format slabs, panels and tiles. Source: Internet