zoom in vb (intr, adverb) 1. (Photography) photog films television to increase rapidly the magnification of the image of a distant object by means of a zoom lens2. (Film) photog films television to increase rapidly the magnification of the image of a distant object by means of a zoom lens3. (Broadcasting) photog films television to increase rapidly the magnification of the image of a distant object by means of a zoom lens4. to examine the smallest details of a subjectCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014