This is the 74th most frequent Hungarian word.
alapján
"Alapján" means "based on" or "according to" in English.
Here, 'alapján' means 'based on' and clarifies the criterion used for the decision.
Az eredmények alapján döntöttünk.
We decided based on the results.
Here, 'alapján' is used to imply advice or action derived from information or data, in this case, the weather forecast.
Az időjárás-előrejelzés alapján vigyél magaddal esernyőt.
Based on the weather forecast, take an umbrella with you.
In this sentence, 'alapján' means 'according to' or 'in accordance with' and indicates adherence to established rules.