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Terreno vs. appezzamento vs. lotto

While terreno, appezzamento, and lotto can all be translated as plot of land, they are not interchangeable. Their differences lie in their level of generality and the context in which they are used, ranging from the general ground, to a piece of farmland, to a legally defined building lot.

Terreno

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Terreno is the most general and common term, meaning land, ground, or soil. It can refer to a vast expanse of land, the ground beneath your feet, or a piece of land with a specific quality or purpose (e.g., agricultural or for building). It is the broadest of the three words.
Abbiamo comprato un 'terreno' di cinque ettari in Toscana.
(We bought a five-hectare piece of land in Tuscany.)
Questo tipo di 'terreno' è molto fertile e adatto alla coltivazione.
(This type of soil is very fertile and suitable for cultivation.)
Attento a dove metti i piedi, il 'terreno' è scivoloso.
(Be careful where you step, the ground is slippery.)
Stanno cercando un 'terreno' edificabile per costruire la loro casa.
(They are looking for a building plot to build their house.)

Appezzamento

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Appezzamento refers to a plot, patch, or parcel of land. It strongly implies a piece that has been sectioned off or divided from a larger area. It is very commonly used in an agricultural context to describe a specific plot designated for farming.
Mio nonno coltiva ortaggi nel suo piccolo 'appezzamento' di terra.
(My grandfather grows vegetables in his small plot of land.)
L'eredità consisteva in diversi 'appezzamenti' di bosco e vigneto.
(The inheritance consisted of several parcels of woodland and vineyard.)
La grande proprietà agricola è stata suddivisa in 'appezzamenti' più piccoli.
(The large agricultural property was divided into smaller plots.)
Ha venduto un 'appezzamento' di terreno per finanziare il progetto.
(He sold a parcel of land to finance the project.)

Lotto

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Lotto is a more technical term for a lot or plot, specifically one that is legally and administratively defined, registered, and often numbered. It is almost always used in a commercial, urban planning, or real estate context, typically for a plot of land intended for construction or sale as part of a development (lottizzazione).
L'impresa di costruzioni ha acquistato l'intero 'lotto' per edificarvi un complesso residenziale.
(The construction company bought the entire lot to build a residential complex on it.)
Questo è il 'lotto' numero 7B del nuovo piano urbanistico.
(This is lot number 7B of the new urban development plan.)
È rimasto in vendita solo un 'lotto' edificabile in questa zona.
(There is only one building lot left for sale in this area.)
All'asta immobiliare, hanno battuto tre 'lotti' di terreno industriale.
(At the real estate auction, they sold three lots of industrial land.)

Summary

In essence, terreno is the most generic word for land or ground. Appezzamento refers to a plot or parcel of land, often agricultural and perceived as a piece of a larger whole. Lotto is a specific, technical term for a legally defined and registered lot of land, typically intended for construction, development, or sale.