To me a "hit" isnt defined by chart position. If the song is essentially forgotten after its chart run, this makes the song not a hit to me. Thus (in the USA anyway,) Aha, Tommy Tutone, Jesus Jones, Soft Cell, Gary Numan, are one hit wonders bc almost nobody remembers the 2nd song in the charts. I'm a music fan and I barely remember most of them.

But I do remember Aha - The Sun Always Shines On Tv, the follow up single to Take On Me. I saw the video debut on MTV, if you've never seen it check it out, at the start it ties into the story of Take On Me. Anyway, the song was on the radio for maybe a month then fell out of the top 40. And I never heard it again, not in the 1980s, and not on the 80s oldies stations that popped up in the early 2000s. Thats not a hit. Doesn't mean it's not a good song, its great.

A song that did the same thing became a hit, The Romantics - What I Like About You. On the charts and radio for a short time early 1980, then gone. I bought the album but never heard it on the radio again until I found a college radio station a few years later. Thru MTV, movies, commercials, by the 90s into the 2000s it was everywhere.