dellequazione

Dellequazione is not a standard Italian word. In normal Italian, the phrase meaning “of the equation” is written as dell'equazione (di + l'equazione) in the singular, or delle equazioni in the plural. The concatenated form dellequazione would be considered a misspelling, a typographical error, or a nonstandard identifier rather than correct grammar.

Origin and grammar: The correct form dell'equazione results from the elision of di and l', yielding dell'. Italian uses contractions such as del, della, dei, delle, and dell' depending on gender, number, and the following word. For a singular feminine noun starting with a vowel (equazione), the appropriate form is dell'equazione. There is no standard Italian form dellequazione.

Usage: In ordinary mathematical writing, use dell'equazione when referring to “of the equation.” For the plural: delle equazioni. Examples: La soluzione dell'equazione è semplice. Le proprietà delle equazioni lineari sono ben note.

Other contexts: In computing, data labeling, or branding, ditections or identifiers might appear as a compound form like dellequazione, but this would not reflect ordinary Italian orthography and could cause ambiguity or mispronunciation.

See also: Italian grammar; elision; apostrophe usage.