The Spanish libra (“pound”) comes from the same Latin word word, libra, meaning, “pound; balance.”

From that root, we get the English: equilibrium (literally, an “equal balance”) as well as deliberate, which literally means “to weigh carefully” (with the de- emphasis).

In Spanish, you weigh literally — but in English, metaphorically.

You can see the l‑b-r root in all of the words.