IPA: /əˈproʊtʃəbl/
KK: /əˈproʊtʃəbl/
Someone who is easy to talk to and friendly, making others feel comfortable approaching them.
The teacher was very approachable, always willing to help students with their questions.
Approachable is formed from "approach" (from Old French *aprochier*, meaning to come near) and "-able" (meaning capable of being). The word means capable of being approached or easily accessible.
Think of someone who is easy to 'come near' ('approach') and 'capable of being' friendly or welcoming — that's what approachable means.