This is the 1112th most frequent Portuguese word.
onda
Wave.
Here, 'onda' refers to the physical waves of water at the beach as a noun.
A praia estava cheia de ondas grandes.
The beach was full of large waves.
In this context, 'onda' is used figuratively to describe a trend or surge in interest.
Ultimamente, há uma onda de interesse por sustentabilidade.
Lately, there is a wave of interest in sustainability.
Here, 'onda' is metaphorical, expressing momentum or trend in technology adoption.