This is the 787th most frequent Catalan word.
mateixes
"Mateixes" means "same" (feminine plural) in English.
In this sentence, 'mateixes' is used as a feminine plural adjective meaning 'same,' agreeing in gender and number with 'noies' (girls).
Les mateixes noies hi seran demà .
The same girls will be there tomorrow.
Here, 'mateixes' acts as an intensifying pronoun (feminine plural) meaning 'themselves,' referring to 'elles' (they).
Elles mateixes van decidir anar-hi.
They themselves decided to go there.
In this context, 'mateixes' is also a feminine plural adjective meaning 'same,' agreeing in gender and number with 'condicions' (conditions).