Compassione means 'compassion' or 'pity'. It refers to a deep feeling of sympathy and sorrow for others who are suffering, accompanied by a strong desire to alleviate that suffering.
In the song, the line "Dal canto tuo nessuna compassione" (From your side, no compassion) highlights a sense of betrayal and hurt. The singer feels that despite their pain, the other person shows no empathy, making this word particularly poignant and central to the song's emotional core.
Come Un'ora Fa opens on something small and ordinary: hot coffee in the morning (“Caffè bollente la mattina” [hot coffee in the morning]), the kind of detail that only matters once it's gone. Giusy Ferreri builds the whole song around the gap between how close two people were and how far apart they've ended up, folded into the title phrase, “Come un'ora fa” [like an hour ago]. She isn't singing about a slow fade. She's singing about how recently this all still worked, which makes the ending sting more, not less.
The chorus keeps circling back to a promise she can't quite keep: “Di non amarti come prima” [not to love you like before], “Non consolarti come prima” [not to console you like before], and then admitting “Siamo distanti più di allora” [we are more distant than back then]. By the bridge the tenderness is gone and she's blunt about it: “La rosa ha mostrato le spine” [the rose has shown its thorns]. It's a breakup song that trades big gestures for the ordinary stuff you miss first.