Each entry contains one or more definitions, within the POS section, below the headword line. They are numbered using the character # in the wikitext. Sometimes, they are grouped into subsenses. The key terms of a definition should be linked to the respective entries.
Some definitions are treated as sentences: beginning with a capital letter and ending with a full stop. In language sections other than English, the definition generally consists of a simple translation into English, rather than a full definition. If necessary, additional information (such as a gloss) should be included to ensure that a translation is not ambiguous or broader than intended. For example, run can indicate a motion of the legs, but it can also refer to the flowing of a liquid. Words that cannot be easily translated can have full definitions.
If appropriate, use context labels at the start of the definition to indicate that it only applies to a certain context: for example, to indicate that it occurs in a limited geographic region or temporal period, or is used only by specialists in a particular field and not by the general population. Many context label templates also place an entry into a relevant category, but they must not be used merely for categorization. See also Wiktionary:Context labels.
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For non-lemma definitions (plurals, conjugations, superlatives, etc.), templates are used with predefined text, linking back to the main entry. In the definition generated by these templates, the link to the main entry is bold when written in the Latin script. The rest of the definition is italic.
For abbreviations, (Examples: PC, USA, SNAFU) do not capitalise words in the expanded form unless that is how the expanded form is usually written. Where the expanded form is an entry that exists (or should exist) in Wiktionary, link to it. Otherwise, if appropriate, link it to the appropriate Wikipedia article, if it exists. When the expanded form does not merit either a Wiktionary entry or a Wikipedia article, link it to its component words. You may expand the definition with a gloss if appropriate.
Some languages have romanizations linking back to the main entries. It is required that each romanization entry contain at least one definition line in the wikitext.