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Có đợt rét đậm kéo dài trên toàn miền Bắc.
There was a prolonged cold spell across the entire northern region.
A distinct period of time characterized by a particular condition, event, or activity.
Đợt nắng nóng vừa qua khiến nhiệt độ vượt ngưỡng 40 độ C.
The recent heatwave caused temperatures to exceed 40°C.
Công ty đang triển khai đợt khuyến mại lớn vào dịp cuối năm.
The company is running a major promotion period at the end of the year.
Often used with weather phenomena (đợt nắng, đợt rét), health events (đợt dịch), or business campaigns (đợt khuyến mại).
'Đợt' implies a shorter, more concrete period (e.g., a heatwave, a sale), while 'thời kỳ' refers to broader historical or abstract phases (e.g., 'thời kỳ đổi mới' - reform period).
From Proto-Vietic *ʔɗɔːt, related to Proto-Mon-Khmer *ɗuut (period, time).
Used for temporary or recurring periods with clear boundaries. Not interchangeable with 'thời kỳ' (longer, more abstract periods).