Topic: BIOLOGY
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cir‧cu‧la‧tion
1 [singular, uncountable]HBH the movement of blood around your body : 
Exercise improves the circulation.
Exercise improves the circulation.2 [uncountable] the exchange of information, money etc from one person to another in a group or society The book was taken out of circulation.
The book was taken out of circulation. remove/withdraw something from circulation The Treasury Department plans to remove older coins from circulation and replace them with new ones.
The Treasury Department plans to remove older coins from circulation and replace them with new ones.3 [countable, usually singular]TCN the average number of copies of a newspaper or magazine that are usually sold each day, week, month etc
4 [uncountable and countable] the movement of liquid, air etc in a system : Let's open the windows and get some circulation in here.
Let's open the windows and get some circulation in here.5 when someone takes part or does not take part in social activities at a particular time : Sandy's out of circulation until after her exams.
in circulation/out of circulation
informalSandy's out of circulation until after her exams.