Here's a good definition of coincidence miracle:
It is important to emphasize that in spite of the widespread belief to the contrary, an event may be the source of marvel and elicit genuine religious response, not only without violating any natural law, but even if all its details may be explained by known laws. As long as an event is genuinely startling and its timing constitutes a mind-boggling coincidence, in that it occurs precisely when there is a distinct call for it to promote some obvious divine objective, then that event amounts to a miracle. The promotion of a divine objective may take many forms: it could be a spectacular act of deliverance of the faithful from the evil forces ranged against them, it might come as a highly unusual meteorological event through which the priests of Baal are discredited, or it might appear as a swift, clear, and loud answer to the prayers of the truly pious. However, whatever form the wondrous event takes, it should have a religious impact on its witnesses. George Schlesinger, “Miracles,” Quinn & Taliaferro (eds.), A Companion to Philosophy of Religion (Blackwell, 1999), 398-99.