缔 is a bound form (b.f.) that only appears in formal or literary compounds, never alone. Its core meaning is 'to form, to establish, or to unite' — you'll see it in words like 缔结 (to conclude a treaty), 缔造 (to create/found), and 取缔 (to ban/prohibit). The 'prohibit' sense comes from 取缔, not from 缔 itself. Because it's a bound form, you always pair it with another character.