Most acids encountered in everyday life are aqueous solutions, or can be dissolved in water, so the Arrhenius and Brønsted–Lowry definitions are the most relevant.
mˈoʊst ˈæsɪdz ɛŋkˈaʊntɚd ɪn ˈɛvɹɪdˌeɪ lˈaɪf ɑːɹ ˈeɪkwɪəs səlˈuːʃənz, ɔːɹ kæn biː dɪsˈɑːlvd ɪn wˈɔːɾɚ, sˌoʊ ðɪ ɚrhˈiːnɪəs ænd bɹˈɑːnstᵻd lˈoʊɹi dˌɛfɪnˈɪʃənz ɑːɹ ðə mˈoʊst ɹˈɛlᵻvənt.