multi-factor authentication
nounUK /ˌmʌlti ˈfæktər ɔːˌθentɪˈkeɪʃn/
US /ˌmʌlti ˈfæktər ɔːˌθentɪˈkeɪʃn/
A way to keep your account safe by using more than one thing to prove who you are.
The app asked for my password and a code from my phone, which is multi-factor authentication.
OTHER MEANINGS
2. A security method that combines something you know, something you have, and something you are.
Banks often use multi-factor authentication with a password, a card, and a fingerprint.
3. An extra check added to a login to make it harder for strangers to get in.
Turning on multi-factor authentication stopped the hacker from opening my email.
4. A system that asks for two or more proofs of identity before letting someone in.
The school's website uses multi-factor authentication for teacher accounts.