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It was a very cold house, especially in winter.
He did not want to upset his father, especially as his mother was so ill.
You'll need to book your ticket in advance, especially if you want to reserve a seat.
India, especially the south, has immense potential to attract tourists.
Don't talk to anyone about this – especially not my mother.
This is the British English definition of especially. View American English definition of especially.
a substance that scientists think exists out in space, but for which they have no direct proof