Weight a minute

As is usually is with etymology, the words you want the most to be related, simply aren’t. Continuing with our discussion on Liberty, the same is derived from Latin “liber-“, mutated into Spanish as “liver-“, which means “free”. So if you believe in people being able to choose between a broader spectrum of choices, you’re a liberal, believing in liberty (we don’t concern ourselves with politics in etymology, simply because we take our words a tad bit more seriously). If you “set someone free”, you’re a liberator, because you “delivered” them from bondage. 

From an eerily similar Latin word “liber”, which means “to weigh” we get a set of words related to weights and measurement. Libra, is an instrument used for weighing. Equilibrium literally means “equal weight”. When you “weigh” different options,  you deliberate; when you judge somebody else’s weight in the matter, you consider their “calibre” (this is slightly muddy in terms of accuracy, but there is evidence to support this claim. Also it’s very “in your face” so it’s probably true). Accordingly, when you get something ready for measurement, you calibrate it. While on weights, Romans used the unit “libra pondo” for weight. It literally means “a pondo of weight”. In non-gibberish that would be “a pound by weight”. Hence, you have pounds which is still abbreviated to “lbs” as a slight wink and nod to those who had too much time on their hands to actually go and read about it.