You should use sizeable with British English audiences, and sizable with American English audiences. Since there is only one letter separating the two words, remembering which spelling to use can be difficult.

What does the word sizeable meaning?

Definitions of sizeable. adjective. fairly large. synonyms: ample, sizable big, large. above average in size or number or quantity or magnitude or extent.

What does sizable mean in a sentence?

: fairly large : considerable a sizable donation.