In most branches of science bi- in composition denotes two, twice, or doubly
2
biternate, doubly ternate, etc. In the composition of chemical names bi- denotes two atoms, parts, or equivalents of that constituent to the name of which it is prefixed, to one of the other component, or that such constituent is present in double the ordinary proportion
3
denotes a quantity but not the order n
4
Denoting a mere result or consequence, as distinguished from telic, which denotes intention or purpose
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Ex-, prefixed to names implying office, station, condition, denotes that the person formerly held the office, or is out of the office or condition now