в то время как

I

As the capacitor charges, the grid and cathode voltages of the output tube rise simultaneously with respect to earth.

II

см. тж. а; тогда как; хотя

Whereas (or While) pillow lavas dominate the Middle Atlantic rift floor, smooth-faced sheet lavas are extensive in the Eastern Pacific rift floors.

Whereas there is just one kind of electric charge, there are three kinds of colour charge.

Meridional rays have the same transit times, whereas transit times for skew rays depend on ...

Источник: Русско-английский научно-технический словарь на Gufo.me