This is the 364th most frequent Czech word.
energií
The Czech word "energií" means "energy" in English (instrumental or genitive plural form).
The word 'energií' here is used to refer to resources of energy that are necessary for performing a task.
Potřebujeme více energií pro tento projekt.
We need more energy resources for this project.
The word 'energií' in this context denotes a sense of vitality or vigor resulting from nourishment.
To jídlo mě naplnilo energií na celý den.
That meal filled me with energy for the whole day.
In this sentence, 'energií' refers generally to the concept of energy in the context of resource economy and sustainability.