This is the 962nd most frequent Serbian word.
метра
"Метра" in Serbian means "meters" (plural of meter), a unit of length.
In this sentence, 'метра' is used to indicate linear measure, specifically in the genitive case singular, quantifying distance run.
Трчао сам пет метара до куће.
I ran five meters to the house.
In this context, 'метра' refers metaphorically to an instrument for measuring, and is used as a nominative singular form.
Метра у мом сећању остаје као једно од непроцењивих искустава.
The mita (a term for a tape measure in some dialects) in my memory remains one of the invaluable experiences.
Here, 'метра' denotes a measuring tape specifically for tailoring purposes, used in genitive case singular to indicate ownership by implication.