The act of using something as a gateway or passage; the process of controlling access through a gateway.
From 'gateway' as a verb plus '-ing' (present participle). This modern usage reflects how 'gateway' has become verbified in contemporary English, especially in computing and business contexts.
In computer science, 'gatewaying' describes how data moves between networks through intermediary servers—it's a digital echo of how medieval cities controlled all information and commerce through physical gates!
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