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MIT post-grad's pre-PhD, 3 letters
Approx. camera flash duration, 4 letters
Brief moment in time: Abbr., 4 letters
Brief moment, briefly, 4 letters
Electronics time meas., 4 letters
Fraction of a tick: Abbr., 4 letters
High-tech time meas., 4 letters
How long it takes light to travel 186 mi., 4 letters
Meas. for a precise stopwatch, 4 letters
Minute time span, for short, 4 letters
Not much time: Abbr., 4 letters
One 60-thousandth of a min., 4 letters
Processing time meas., 4 letters
Processing time unit: Abbr., 4 letters
Quicker than a flash (Abbr.), 4 letters
Short time, for short, 4 letters
Teensy time unit: abbr., 4 letters
Tiny bit of a tick: Abbr., 4 letters
Tiny bit of time: abbr., 4 letters
Tiny time unit: Abbr., 4 letters
Very short time, for short, 4 letters
What some PC operations are measured in, 4 letters
One thousandth of a second, 4 letters
Advanced teaching deg., 4 letters
Grad deg. for teachers, 4 letters
Teacher's advanced deg., 4 letters
Teacher's grad deg., 4 letters
Teachers coll. deg., 4 letters