1. A second occurrence or surge of something, particularly a movement, trend, or phenomenon that had previously occurred
The second wave of COVID-19 cases hit the country harder than the first.
A segunda onda de casos de COVID-19 atingiu o país mais duramente do que a primeira.
2. In feminism, the feminist movement of the 1960s-1980s following the first wave of the early 20th century
Second wave feminism focused on workplace equality and reproductive rights.
O feminismo da segunda onda focou na igualdade no trabalho e direitos reprodutivos.
3. A subsequent group or batch of something arriving after an initial group
A second wave of immigrants arrived at the port the following month.
Uma segunda onda de imigrantes chegou ao porto no mês seguinte.