IPA: /ˈsaɪzəbli/
KK: /ˈsaɪzəbli/
In a way that is large in size or amount.
The project was sizeably larger than we initially expected.
Sizeably → It is formed from "size" (from Old French *size*, meaning a measurement or dimension) and "-ably" (a suffix meaning in a manner that is). The word "sizeably" means in a manner that relates to a significant measurement or dimension.
Think of 'size' as a measurement and remember that 'sizeably' means in a manner that relates to a significant measurement.