Plural form of enlargement; the act or result of making something bigger, or prints made from a smaller photographic negative.
From 'enlarge' (en- + large, from Old French 'large') + -ment suffix indicating an action or result. The word evolved from literal physical expansion to include photographic reproductions.
Before digital photography, darkrooms used enlargers to blow up tiny negatives into massive prints—a photographer could make a 35mm film frame into a 16-by-20 poster, which seemed like magic at the time!
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