IPA: /sɜːrˈtɪfɪəbli/
KK: /sɜːrˈtɪfaɪəbli/
In a way that can be officially confirmed or recognized as true or valid.
The product is certifiably safe for use by children.
Certifiably → It is formed from "certify" (from Latin "certificare", meaning to make certain or to confirm) and the suffix "-ably" (meaning in a manner that can be). The word "certifiably" means in a manner that can be confirmed or made certain.
Think of the word 'certify' which means to confirm something, and remember that 'certifiably' means something can be confirmed in a certain way.