This is the 922nd most frequent Polish word.
maju
"Maju" is the locative or genitive form of "maj," which means "May" (the month) in Polish.
In this sentence, the word 'maju' is the locative form of 'maj' (May) used after the preposition 'w' (in) to indicate a time period.
W maju często chodzimy na spacery, ponieważ pogoda jest piękna.
In May, we often go for walks because the weather is beautiful.
Here, 'maju' should be 'mają', which is the third-person plural form of the verb 'mieć' (to have); this demonstrates a grammatical error that could serve as a teaching point about verb conjugation in Polish.
Małe dzieci maju często ulubione zabawki, które noszą ze sobą wszędzie.
Young children often hold their favorite toys, which they carry everywhere.
Here, 'maju' is used similarly to the first example, being the locative case of 'maj' (May) to indicate the time of the celebrations.