Accelerando (gradually getting faster).
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To return to the original tempo, "a tempo" is written in the music
Absolute Music
Neither of them is an indication of absolute speed, so neither of them is slower than the other. They both mean that the music should gradually get slower, but that is all. They indicate a process, not a state.
ritardando is slowing down, and so is rallentando. they are abbreviated rit. or ritard and rall.
Legato is the indication for the movement of entire composition to play smoothly.