This is the 956th most frequent Czech word.
onemocnění
The Czech word "onemocnění" translates to "disease" or "illness" in English.
Here, 'onemocnění' refers to an illness or sickness that explains someone's inability to attend work, used as a subject of the sentence.
Onemocnění je příčinou jeho nepřítomnosti v práci.
The illness is the reason for his absence at work.
In this sentence, 'onemocnění' denotes diseases or health conditions in general, indicating categories of medical issues.
Lékař zkoumá různé druhy onemocnění.
The doctor studies various kinds of diseases.
Here, 'onemocnění' is in the plural and refers to various serious illnesses that might be avoided through early medical intervention.