Declension

Definition and stakes

Benjamin Leonard D'Ooge,  Latin for beginners (1911)

“ THE THIRD DECLENSION • Ī-STEMS
241. To decline a noun of the third declension correctly we must know whether or not it is an i-stem. Nouns with i-stems are
1. Masculines and feminines:
a. Nouns in -ēs and -īs with the same number of syllables in the genitive as in the nominative. Thus caedēs, caedis, is an i-stem, but mīles, mīlitis, is a consonant stem.
”
Source: Wikisource

Edward Adolf Sonnenschein,  Ora Maritima (1909)

“ And the forms of the adjective taken by the different classes of nouns are called by the same names.
In order to know to which class a noun belongs (and therefore which form of the adjective it takes) , observe the following rules:-
Nouns of the 1st Declension are feminine, except those denoting male persons, which are masculine: thus insula, casa, ōra, amita, are feminine; agricola, nauta, poēta, incola, are masculine.
”
Source: Wikisource

G. J. Adler,  A Practical Grammar of the Latin Language… (1858)

“ The genitive of this declension is um, or ium. E. g., lapidis, pl. lapidēs, lapidum; vestis, pl. vestis, vestium; pistōris, pl. pistōrēs, pistōrum; capitis, pl. capita, capitum; turpis, pl. turpēs, neut. turpia, gen. turpium. Masculines and feminines of the fourth declension retain the ūs of the genitive singular, and neuters (in ū) assume the termination ua. The genitive plural of this declension is uniformly uum. E. g. frūctūs, frūctuum; cornua, cornuum. Nouns of the fifth declension form their plural in ēs, and their genitive ērum ”
Source: Wikisource

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