This usually means a ratio. An recipe example would be using SUGAR:FLOUR (ratio). The sign : mean one to the other. So my recipe for cake would be a 2 (cups sugar): 3(cups flour).
This is just an example. Engines have ratios math has ratios, etc. It is BLANK parts:to BLANK parts.
This is the best I can explain it, and there are so many examples out there to to it with. Knowing your subject needing the answer of 1:1 would be helpful.
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