for ‧ tu ‧ nate ‧ ly /ˈfɔːtʃ ə nətli $ ˈfɔːr-/ BrE AmE adverb [sentence adverb]
[ Word Family: noun : ↑ fortune , ↑ misfortune , ↑ unfortunate ; adverb : ↑ fortunately ≠ ↑ unfortunately ; adjective : ↑ fortunate ≠ ↑ unfortunate ]
happening because of good luck SYN luckily :
Fortunately, everything worked out all right in the end.
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In everyday English, people usually say luckily rather than fortunately :
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Luckily, no one was hurt.