This is the 135th most frequent Estonian word.
aru
Understanding; sense; intellect.
Here, 'aru' refers to intellect or the capacity for reasoning, describing someone's mental ability.
Tal on hea aru, ta lahendas ülesande kiiresti.
He has good intellect; he solved the problem quickly.
In this sentence, 'aru' describes 'comprehensible' or 'understandable', relating to the ability to be understood or processed cognitively.
Aru saadav info tuleb enne läbi mõelda.
The comprehensible information should be thought through beforehand.
In this sentence, 'aru' is used to denote 'understanding' or 'comprehension', forming an idiomatic expression that conveys the process of grasping meaning.