Usually the ending -ary can be replaced with -ario in Spanish.
anniversary = aniversario
diary = diario
dictionary = diccionario
extraordinary = extraordinario
imaginary = imaginario
necessary = necesario
ordinary = ordinario
primary = primario
salary = salario
secondary = secundario
secretary = secretario
Some exceptions: contemporary (contemporáneo), temporary (temporal).
Actually you can say temporario, but this usage has fallen into disuse!
