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Spanish word casi comes from Latin quam, Latin qua, Latin si (If, supposing that.)
quam (Latin)
(after comparative nouns) than. (in comparisons) as. In what (which) way, to what (which) degree; how, how much, as much as, as far as.
qua (Latin)
In so far as. In what way, how, by what method; to what degree or extent. On which side, at or in which place, in what direction, where, by what way (qua...ea...). As; in the capacity or character of.
si (Latin)
If, supposing that.
quasi (Latin)
As (like). As if.
casi (Spanish)
Almost.