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a type of low-frequency amplitude modulation

Tremolo is a type of low-frequency amplitude modulation.

a specific type of right hand technique so practicing these exercises

That said, tremolo is a specific type of right hand technique so practicing these exercises should help organize your right hand.

a device that creates a vibrato effect by mechanically shaking the wind source or by some other means

Tremolo is a device that creates a vibrato effect by mechanically shaking the wind source or by some other means, and so some other means changes the normal flat sound to a warbly one, which I am sure you are familiar with.

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a technique that truly sets our instrument apart from the rest

Tremolo is a technique that truly sets our instrument apart from the rest...

one of the oldest effects in the guitarist

Tremolo is one of the oldest effects in the guitarist

the rapid reiteration of a string: ) plucking of the same string, although not necessarily on the same note many times, quickly and next to each other (although usually separated by a melody in the thumb

Tremolo is the rapid reiteration of a string: plucking of the same string, although not necessarily on the same note many times, quickly and next to each other (although usually separated by a melody in the thumb).

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the mandolin counterpart to the violins vibrato but even more important

Tremolo is the mandolin counterpart to the violins vibrato but even more important if you want to get that simulated sustain, especially on classical pieces.

the modulation of the volume of a note

Tremolo is the modulation of the volume of a note.

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a repeated oscillation in volume but

Tremolo is a repeated oscillation in volume but even a few tiny waverings of the bellows can add enormous musical content in tone.

another effect many amps feature (great for surf guitar

Tremolo is another effect many amps feature (great for surf guitar.)