Forte
forte.
fortissimo
The term that describes how loud a sound is is "volume." Volume is the measure of the intensity or amplitude of a sound, typically measured in decibels.
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.
Volume
piano
The term mezzo piano indicates a medium soft volume level that one should play at.
piano
The term "fz" in music notation signifies a sudden loud accent followed by an immediate decrease in volume.
"Volume" is a term referring to how loud a sound is to humans and animals. Most entertainment devices that use sound have a "Volume Control", typically labelled, "Volume". Volume is not quite the same as "Loudness", by the way.
It can be called dynamic level, loudness or volume. It is correlated with what is called the amplitude of the sound waves the musical instruments produce.
piu means "more" ( Compare the Latin word plus) piu forte means "more loud" , that is "louder".