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He's been ill for a couple of weeks.
She was too ill to travel.
mentally ill patients
terminally ill (=going to die because of an illness)
Her husband is seriously ill in the hospital.
She was unlucky enough to fall ill on vacation.
Sarah was seriously ill with a fever.
This is the American English definition of ill. View British English definition of ill.
the part of a church where the priests and choir sit during a religious ceremony