IPA: /ˌæm.bɪˈdɛk.strə.ti/
KK: /æmˌbɪˈdɛkstrɪti/
The ability to use both hands equally well for tasks, such as writing or throwing.
Her ambidexterity allowed her to write with both hands simultaneously.
Ambidexterity is formed from "ambi-" (meaning both) and "dexter" (from Latin, meaning right or skillful). The word describes the ability to use both hands with equal skill, hence being adept with both sides.
Think of being 'skilled with both hands' — 'ambi-' means both, and 'dexter' relates to skill or the right hand.