One Single Currency Might Rule The Entire Shopify World - InsightFlow
One-to-one is used when you talk about transfer or communications. You may use one-to-one when you can identify a source and a destination. For eg., a one-to-one email is one sent from a single person to another, i.e., no ccs or bccs.
Understanding the Context
In maths, a one-to-one mapping maps one element of a set to a unique element in a target set. One-on-one is the correct adjective in your example. See Free ... You typically wouldn't use either phrase for meetings.
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Key Insights
'One-to-one' is rare and often technical in any case, you might say, 'On most websites there is a one-to-one relationship between a username and an account,' meaning that there is only one username per account, and only one account per username. As @FumbleFingers said, 'one-on-one' tends to suggest physical activity, or at least ...
