This is the 260th most frequent Polish word.
miało
"Had" (third-person singular, neuter, past tense of "mieć").
'Miało' here indicates an expectation or plan that something was supposed to happen.
Miało być słonecznie, ale padał deszcz.
It was supposed to be sunny, but it rained.
'Miało' in this case refers to the occurrence of an event in the past.
Kiedy miało miejsce to spotkanie?
When did that meeting take place?
'Miało' here expresses an assumption or possibility related to someone's knowledge or awareness.