/ ˌmægnɪfɪˈkeɪʃn; NAmE / noun
1.
[ U ] the act of making sth look larger :
The insects were examined under magnification.
2.
[ C , U ] the degree to which sth is made to look larger; the degree to which sth is able to make things look larger :
a magnification of 10 times the actual size
high / low magnification
The telescope has a magnification of 50.