exceptionnellement
exceptionally, as an exception
adverb ehk-sep-syo-nel-MAHN Rare
Usage Note
Exceptionnellement means something happens only as a rare exception to normal practice — exceptionnellement, le musée sera ouvert le lundi (exceptionally, the museum will be open on Monday). It differs from extraordinairement (extraordinarily), which emphasises remarkable degree rather than rarity of occurrence. It often introduces a temporary change to a usual schedule.
Examples
"Exceptionnellement, la boutique est ouverte dimanche."
Natural Translation
Exceptionally, the shop is open on Sunday.

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