This is the 13109th most frequent Russian word.
мгновения
Moments.
Here, "мгновение" is used to denote a singular moment in time with an emphasis on its uniqueness.
Каждое мгновение жизни уникально.
Each moment of life is unique.
Here, "мгновения" emphasizes brevity and the fleeting nature of time.
В эти короткие мгновения счастья всё казалось идеальным.
In those brief moments of happiness, everything seemed perfect.
In this context, "мгновения" highlights specific, vivid instances of time that hold significance.