At the same time and In the act of

At the same time adverb - At the same instant.

In the act of and at the same time are semantically related in part of speech topic. In some cases you can replace phrase "In the act of" with "At the same time", this phrases are similar, when it comes to topics like while.

At the same time and in the act of are semantically related in while topic. Sometimes you can replace phrase "At the same time" with "In the act of", this phrases are similar.