To charge with electricity or convert something into an electrical form.
From 'electral' (adjective form relating to electricity) plus the suffix '-ize' meaning to make or cause to become. Emerged in the 18th-19th centuries as electricity became understood.
This is an older, somewhat archaic way to say 'electrify'—it shows how English speakers experimented with different word formations as they tried to name this new mysterious force.
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