This is the 378th most frequent Romanian word.
trecută
"Trecută" in English means "passed" or "past" (feminine singular form).
In this sentence, 'trecută' is an adjective agreeing with 'săptămâna' (week), describing it as 'last' or the one preceding the current one.
Săptămâna trecută am vizitat un muzeu interesant.
Last week I visited an interesting museum.
'Trecută' as an adjective describes 'învățătura' (lesson), indicating it is from the past.
Învățătura trecută a fost înțeleasă de toți elevii.
The past lesson was understood by all students.
Here, 'trecută' is intended to agree with 'Amintirea' but there's a mismatch in gender agreement - the correct usage should be 'trecut',