[zbobet2012]

No. A precise oscillator ticks as close to the second mark as it can, but may be biased in one direction or another consistently. A precise clock can be thought of as a ruler with graduations down to millimetres, where every millimetre is 1% too short. In an accurate clock (like atomic clocks) every millimetre may be 10% too long or too short, but in a random direction.

In the precise ruler if you measure out a 1000 milimeters you will be 1 milimeter short. In the accurate ruler you will be 1/10th of a millimetre long or short.

Both are useful. If you're a carpenter measuring a space to put a cabinet in and you use the same ruler to measure the openings as to cut the cabinet you'd rather the ruler be precise than accurate. If you email those measurements to someone else you'd rather the ruler be accurate than precise.

[omegalulw]

Simpler version: _accuracy_ is how close the mean of your measurements is to the true value, _precision_ is the variance of your measurements.