This is the 6537th most frequent Catalan word.
primo
"Primo" in Catalan means "cousin" (male).
In this sentence, 'primo' is used as a noun meaning 'cousin'.
El meu primo és molt divertit.
My cousin is very funny.
Here, 'primera' is the feminine form of 'prim', derived from Latin 'primus', meaning 'first'.
És la meva primera vegada al teatre.
It's my first time at the theater.
In this context, 'prim' is an adjective meaning 'thin' or 'subtle'. It describes the nature of the action.