Dyspnea means difficulty breathing, which causes an out of breath feeling. It is a symptom caused by innumerable health conditions. Being short of breath during or after exercise or physical exertion is expect. But being breathless without a cause can immediately trigger panic, fear and anxiety. Dyspnea is an indication that your body is hungry for oxygen.
Definition of plenty. 1  1a : a full or more than adequate amount or supply had plenty of time to finish the jobb : a large number or amount in plenty of trouble. 2  2 : the quality or state of being copious : plentifulness.
The word quantity means, amount or how many. When the word is used mathematically, it is usually used because the quantity (amount) is unknown. For example 4 times the quantity x plus 6, would be written as: 4(x+6). Because what x+6 equals is unknown, it is referred to as a quantity. I hope this helps.