What does ca. stand for in ".. the length is ca. 1m"?

I guess it is approx. but not so sure.

Answer:
"ca." is an abbreviation for the Latin "circa", which means "about" or "near". In the usage you quote, it mean "approximately", as you correctly guessed.
Short for "circa" - Latin 'about'
cca = circa (lat.) = approx.

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