в действительности

см. тж. в практической работе; фактически

This deviation is often negligible in practical situations.

In actuality (or In actual fact, or Actually) the engineer is concerned with other problems.

In (actual) practice (or conditions) (or In reality, or In practical work) complete equilibrium can never be attained.

In actual truth, no satellite planet has been located for Mercury.

This is a simplified representation; in real situations many different spots are formed.

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