Declension and Conjugation
In Latin, most words are actually "stem + ending". The stem tells you the basic meaning (man, woman, large, small, run, sit, etc.) and the ending tells you how to use it in the sentence (subject vs. object, describes THIS vs. THAT, happens now vs. earlier, etc.).
Declensions are groups of nouns (and adjectives). There are five declensions in Latin (nouns use all five; adjectives use the first three), and each declension has a different set of endings to use for its nouns. Nouns and adjectives are grouped in another way: by gender. Latin has three genders (masculine, feminine, and neuter), and most declensions will include two or more genders. When this happens, you often have similar-but-different endings for the different genders.
For example, in the dictionary, a 2nd declension masculine noun ends in -us or -r (equus=horse; puer=boy), but a 2nd declension neuter noun ends in -um (templum=temple).
(Why do I say "in the dictionary"? Nouns can change their endings, but they're always listed with two forms and their gender. The different forms are because the first form - called the nominative singular - often has a different spelling in its stem than the rest of the forms. The second form - called the genitive singular - gives the stem for the rest of the forms.)
Conjugations are groups of verbs. There are four (and a half) conjugations in Latin, and each conjugation has a different vowel in its infinitive. Usually all the conjugations use the same sets of endings, but sometimes 3rd conjugation, 3rd -io conjugation, and 4th conjugation like to use different endings.
In a dictionary, verbs are listed with four forms. The different forms exist because verbs (like nouns) have different spelling in their stems based on what form the verb is. However, verbs have THREE different stems whereas nouns just have one. (I am not including the first form for either nouns or verbs as a separate stem because in both cases, that form is only used in one place.) Having three different stems means that Latinists (people who know Latin) need to know the different stems...which are shown in the 2nd, 3rd, and 4th form listed in the dictionary.
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