Definitions for "No-Fault Divorce"
a divorce granted with neither party having to prove the other is guilty of marital misconduct. No grounds are necessary, just an allegation that the marriage is irretrievably broken and cannot be preserved.
Divorce that may be granted even though no spouse has performed any kind of marital misconduct - there had been "no fault"
A divorce in which it it doesn't matter who did what to whom that caused the marriage to break down; all that matters is that there is no reasonable prospect of reconciliation.