When you think of the word "spot", think of "on the spot" or immediate. The spot rate of a commodity, currency or security is the quote given for a transaction's immediate settlement, with the settlement date usually taking place a couple of days after a trade is executed. It's like saying,
Source: http://www.investorguide.com/igu-article-1150-forex-basics-difference-between-spot-and-futures-in-forex.html
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