IPA: /ˈkæli/
KK: /ˈkæl.i/
The person who receives a phone call or is called by someone else.
When I called my friend, she was the callee on the other end of the line.
Callee → The word 'callee' originates from the verb 'call' (from Old English 'ceallian', meaning to cry out or summon) with the addition of the suffix '-ee' (meaning a person who is the recipient of an action). Therefore, 'callee' refers to the person who is being called.
Think of someone who is the 'recipient' ('-ee') of a 'call' — that's why a callee is the person being called.