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Explanation: "Basis"; "foundation"; or even "base device", specially since you indicate "Technology".
Luis Luis United States Local time: 05:24 Native speaker of: Portuguese PRO pts in pair: 35
Explanation: Here is an entry from a glossary (URL for entry, and for glossary pasted in, under "References" below):
A base currency is the currency in which an institution quantifies its risks. The choice is important in risk estimation because it can alter the results. For example, a Treasury bill may entail little risk for an investor who calculates risk in US dollars. Because of exchange rate risk, however, it would be quite risky for an investor who used the French franc as a base currency. Most institutions estimate risk in the currency that they use for accounting.