Rill is another word for stream
The path that a stream follows is a channel.
velocity
A male singer is often referred to as a "bard." This term historically describes a poet and musician, particularly one who composes and sings songs about heroic deeds.
term
Dead letter mail
It may be a motu proprio or an encyclical, depending upon the purpose.
Well, you're thinking about "volume", but in music equipment, they are not the same. Volume describes how loud the equipment is. Loudness is a term that describes a process which makes the high notes and the very low notes louder at a low volume level.
A literary term for a small stream is "brook."
Cost Flow Assumption
In mathematics the term quadratic describes something that pertains to squares. (quadratus is Latin for square)
The parallelogram and the kite both fit that description.
Which geometric term describes a ruler