in phase v. out of phase

in phase : in a synchronized or correlated manner

-out of phase : in an unsynchronized manner : not in correlation

Merriam Webster Internet Dictionary. The 1996 printed version says the same.

The above is how I use the terms "in phase" and "out of phase." in relation
to theoretical exact just intonation intervals or chords v. the same just
temperamed +/- 2 cents. JI is in phase when done electonically, and JT is out
of phase when done electroncially or acoustically.

Pauline