noun
a category of seating on a plane or train that is of a higher standard than economy class
adjective
of the best quality or highest rank
adverb
used to describe something done in the best or most superior way
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The airline offers first class seating for passengers who want extra comfort and luxury.
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I always try to upgrade to first class when I fly, it's so much more comfortable.
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Flying first class is like living the high life, with all the fancy amenities.
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Her performance in the competition was first class, she truly excelled in every aspect.