This is the 1st most frequent Czech word.
a
The Czech word "a" means "and" in English.
The conjunction 'a' here means 'and', connecting two subjects performing the same action.
Petr a Marie šli do kina.
Peter and Mary went to the cinema.
The conjunction 'a' connects two independent clauses, indicating a sequential or additive relationship between them.
Řekl mi tajemství, a já jsem to nikomu neřekl.
He told me a secret, and I didn’t tell it to anyone.
The conjunction 'a' followed by the word 'přesto' ('yet') creates a contrasting emphasis in the sentence.