繁 is a bound form (b.f.) — it cannot be used alone as a word but appears as a morpheme in compounds. Its meanings fall into two main groups: one related to 'numerous, complicated' (e.g., 繁华 'prosperous', 繁忙 'busy', 繁多 'various'), and another related to 'to multiply, to propagate' (e.g., 繁殖 'to reproduce', 繁衍 'to multiply'). The specific sense depends on the compound it forms.