If something is quantifiable, you can measure it and write it as a number or an amount — how many, how much, how often, how heavy. Sales, test scores, and hours of sleep are quantifiable. How kind a person is, or how beautiful a view feels, is much harder to pin to a figure. Offices and science like this word because a number looks clear and easy to compare. Though actually, calling something quantifiable does not mean the number tells the whole story: you can count the times a student speaks in class and still miss whether they understood. If you cannot turn it into a fair number, it is not really quantifiable, even if someone puts a score on it.