This is the 1956th most frequent Arabic word.
ويعتقد
"He believes" or "It is believed."
The word 'ويعتقد' is used in a passive form indicating a general belief or assumption without specifying the individual who holds the belief.
ويعتقد أن العالم يتطور بسرعة.
It is believed that the world is evolving rapidly.
Here, 'ويعتقد' is used in a personal context to express the shared belief or thought of the speaker and their brother.
أنا ويعتقد أخي أننا سنستمتع بالإجازة.
My brother and I think we will enjoy the vacation.
In this sentence, 'ويعتقد' introduces the belief or hypothesis of a specified group, in this case, scientists.