What is the linguistic meaning of 'Riba' (usury/interest)?

Primary text

Linguistically, Riba signifies increase or excess. This is evidenced in the Quran where Allah states, "And when We send down upon it water, it vibrates and grows (warabat)" (Quran 22:5) and "that one nation may be more numerous (arbā) than another nation" (Quran 16:92). To say 'arbā fulan 'alā fulan' means that so-and-so increased over another.