obdobími
Obdobími is the instrumental plural form of the Czech noun období, which means a period of time, a span, or an era within a sequence of events. The noun is neuter; its instrumental plural is used in sentences where the noun functions in the instrumental case, typically after prepositions that require instrumental (for example with, between) or in statements about actions involving periods.
Období itself denotes a subdivision of time within a larger context, such as history, geology, or a
In practice, obdobími appears in phrases like “s různými obdobími” (with different periods) or “mezi různými obdobími
Usage notes: obdobími is mainly a grammatical form, but the concept it conveys—periods or phases within a