IPA: /dɪˈpɛndənt/
KK: /dɪˈpɛndənt/
A person who relies on another for support, especially financial support.
As a single parent, she has to provide for her child who is her dependant.
Dependants are formed from 'depend-' (from Latin 'dependere', meaning to hang from or rely on) and '-ant' (a suffix used to form adjectives or nouns indicating an agent or something that performs an action). The word 'dependant' refers to someone who relies on another for support or sustenance.
Think of someone who 'hangs' ('dependere') on another for support — that's why a dependant is someone who relies on someone else.