Every latin noun belongs to one of five declensions, each declension having several endings, depending on how the word is used in a sentence. To take one example, "filia" means "daughter," but it can be "filia" in "She is the daughter," "filiae" in "the daughter's cloak," "filiam" in "we see the daughter," or "filia" in "Tell the daughter I was here." There are other endings for plural forms, and whole different sets of endings for nouns of other declensions.
Esse is the verb "to be". Only nouns are declined, therefore it is in no declension.
nunnation - it occurs in Arabic
And from the first declension of the flesh I learnt man's tongue, to twist the shapes of thoughts Into the stony idiom of the brain. To understand spoken Latin clearly, you have to master the declension of its verbs.
In the Indo-European languages, words may have different endings according to their relationship to the other words in a phrase or sentence. The array of such forms for a word is called the declension.
vir (in the nominative case) and vim in the accusative case) Both 3rd declension nouns
There is no grammatical limitation on the use of Latin prepositions. Any preposition can be used with any noun regardless of declension, as long as the combination makes sense semantically (that is, according to the meaning of the words, not their grammar).
Only first declension Latin feminines end in -a. Most feminine nouns do not.
3rd Declension
Third declension.
Bellum is a 2nd declension neuter noun meaning "war". Neuter nouns have a plural ending in -a, so the plural of bellum is bella.
Mare (sea) is 3rd declension.
First declension.