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degree (angle, temperature, scale, etc.)
counter for occurrences
strength (of glasses); glasses prescription
alcohol content (percentage); alcohol by volume
extent; degree; limit
presence of mind; composure
「度」 has another reading with different meanings.
気温が三十度あってとても暑い。
The temperature is 30 degrees and it's very hot.
私はパリには一度しか行ったことがない。
I have only been to Paris once.
二度目の訪問でもう慣れました。
I'm already used to it on the second visit.