This is the 754th most frequent Persian word.
متحد
United; allied.
The word "متحد" is used here as an adjective to denote the collective, harmonious action or state of being of the unions.
اتحادیههای کارگری متحد و همصدا عمل میکنند.
The labor unions act unitedly and in unison.
The word "متحد" is used as an adjective meaning "united," describing the state of being in agreement or alliance.
ایران و روسیه در این موضوع متحد شدند.
Iran and Russia united on this matter.
Here, "متحد" signifies an ally, indicating someone who supports or collaborates emotionally or strategically.