Most Popular. 1  GCHQ challenges you to crack codes for charity with its first ever puzzle book. 2  A Christmas card with a cryptographic twist for charity. 3  Foreign Secretary appoints new Director GCHQ.  Applications open for GCHQâs Cyber Summer 1  Schools. GCHQ Cheltenham.
matter of the heart definition, matter of the heart meaning | English dictionary. matter. 2 substance that occupies space and has mass, as distinguished from substance that is mental, spiritual, etc. n the substance or main theme of a book, discussion, debate, etc.
Heart Rate (Definition) Heart rate is a measurement of the number of times a person's heart beats in one minute. Normal heart rates vary with a person's age and with excitement and exercise. Abnormal heart rates are too slow, too fast, and/or irregular (too much variation in the rate).