In Italian, the adjectives stesso and medesimo compare items or add emphasis. They must agree in gender and number with the noun they modify. Their meaning changes based on where they are placed in relation to the noun.
Exact Identity: "The Same"
When placed before a noun, stesso means "the same."
| We chose the same restaurant. | Abbiamo scelto lo stesso ristorante. |
Medesimo works exactly the same way, though it can sound slightly more formal or emphatic ("the exact same").
| It is not the same shade of purple. | Non è la medesima sfumatura di viola. |
| The two copies have the same format. | Le due copie hanno il medesimo formato. |
To add heavy emphasis, you can pair stesso with identico.
| We have the exact same version of the book. | Abbiamo la stessa identica versione del libro. |
Reflexive Emphasis: "Himself" or "Itself"
Placed after the noun, stesso and medesimo act as intensifiers, meaning "himself," "herself," "itself," or "themselves." This highlights that a specific person or thing—and no one else—is involved.
| The author himself did not have a copy. | L'autore stesso non aveva una copia. |
| The problem itself is not complicated. | Il problema stesso non è complicato. |
Stesso is much more common for this purpose in everyday speech, but medesimo can also be used.
| The doctor himself called. | Il dottore medesimo ha chiamato. |
Putting It All Together
You can use both placements in the same sentence to emphasize who did something and the identical object involved.
| The owner himself sold the same car. | Il proprietario stesso ha venduto la medesima macchina. |