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n. (also fainting episode)
a short period of time when a person becomes unconscious晕厥
例：Postural syncope occurs when the body cannot supply enough blood to the brain in the upright position because of low blood pressure.
adj. to feel weak, as if you are about to become unconscious
例：She felt faint with hunger.
v. to suddenly become unconscious for a short time, usually falling down晕厥；晕倒
例：He faints at the sight of blood.
I nearly fainted in the heat.
She took one look at the hypodermic needle and fainted (dead) away (=became unconscious immediately).
adj.feeling as if everything is turning around, and that you are not able to balance and may fall down
例：I felt dizzy with excitement as I went up to collect the award.
Syncope is just another word for fainting from any cause, and usually means a problem with the heart. People can feel dizzy from a lot of different reasons, including vertigo, which is usually a problem with the ears, or other causes of dizziness that have to do with the nerves. But syncope means fainting from a disease of the heart.
As adjectives the difference between dizzy and faint is that dizzy is having a sensation of whirling, with a tendency to fall; giddy; feeling unbalanced or lightheaded while faint is lacking strength; weak; languid; inclined to swoon; as, faint with fatigue, hunger, or thirst.
As verbs the difference between dizzy and faint is that dizzy is to make dizzy, to bewilder while faint is to lose consciousness caused by a lack of oxygen or nutrients to the brain, usually as a result of a suddenly reduced blood flow (may be caused by emotional trauma, loss of blood or various medical conditions).