My book defines accuracy as the closeness of a measurement to the real/actual value, precision as when a set of values are consistent with each other (i.e. close to each other) and sensitivity as the smallest possible reading of an instrument (i.e. to how many decimal places it can measure). Ive searched the web and Im finding these definitions too. However Ive read "precision" in the context of an instrument (rather than actual measurement values) being applied to what my book defines as sensitivity and have even heard accuracy too. Are these just non technical words used in the lay world or am I missing something here? Would it be,for example, incorrect to say my ruler is precise to the nearest mm or accurate to the nearest mm?