Solution:

Given:

• "do re me" → "he is late"
• "fa me la" → "she is early"
• "so ti do" → "he leaves soon"

Step-by-step analysis:
1) Compare "do re me" → "he is late" and "so ti do" → "he leaves soon".
Common word: "do"
Common meaning: "he"
⇒ So, "do" = "he"

2) Now in "do re me" → "he is late", remove "do" = "he"
Remaining: "re me" → "is late"

3) Compare "re me" → "is late" and "fa me la" → "she is early"
Common word: "me"
So, "me" appears in both and matches with: "late" or "early" — but can't be both.
But we already saw from above:
"me" appears in both 'late' and 'early' sentences → must be "is"

4) Now from "re me" → "is late", and "me" = "is", it implies:
"re" = "late"

Final Answer:
"re" means "late".