By good fortune; SYN. fortuitously, luckily, as luck would have it.
ETYM From Happy.
1. In a joyous manner; SYN. merrily, mirthfully, gayly, blithely, jubilantly, with happiness.
2. In an unexpectedly lucky way.
ETYM From Lucky.
In a lucky manner; by good fortune; fortunately; -- used in a good sense.