[*] 30. The gender of Latin nouns is either natural or grammatical. [*] a. Natural Gender is distinction as to the sex of the object denoted: as, puer (M.), boy; puella (F.), girl; rēx (M.), king; rēgīna (F.), queen. nauta, sailor) usually though not necessarily male are always treated as masculine. Similarly names of tribes and peoples are masculine: as, Rōmānī, the Romans; Persae, the Persians. Paegnium , Glycerium .
[*] Note 3.--Names or classes or collections of persons may be of any gender: as, exercitus (M.), aciēs (F.), and agmen (N.), army; operae (F. plur.), workmen; cōpiae (F. plur.), troops<*> senātus (M.), senate; cohors (F.), cohort; concilium (N.), council.[*] b. Grammatical Gender is a formal distinction as to sex where no actual sex exists in the object. It is shown by the form of the adjective joined with the noun: as, lapis māgnus (M.), a great stone; manus mea (F.), my hand.