An arene epoxide is epoxide formally derived from an arene by the addition of an oxygen atom to a double bond.

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An arene oxide is an alternative name for an arene epoxide, an epoxide formally derived from an arene by the addition of an oxygen atom to a double bond.

An alkoxylation is a reaction with an alkoxy group, an alkoxide or an epoxide.

This reaction occurs when a compound is converted into an epoxide. One reaction that comes to mind is when a double bond reacts with a peracid such as MCPBA to form an epoxide ring on that bond (it then becomes a single bond).