IPA: /ˈrɛdiər/
KK: /ˈrɛdiər/
More prepared or willing than someone or something else.
She was readier to help than anyone else in the group.
Readier → It is formed from "ready" (from Old English *ræde*, meaning prepared or willing) and the comparative suffix "-er" (meaning more). The word "readier" means more prepared or willing than another.
Think of someone who is 'prepared' ('ready') and then imagine them being 'more' prepared when you add '-er'.