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{{#category_index:L|lead}} 1. An indication of interesting structural or other geological conditions; see resource. 2. The amount of time by which one event is ahead of another, or by which an arrival is ahead of its ‘‘normal’’ arrival time. Negative of lag. 3. The phase angle by which current is ahead of emf in a capacitive electrical circuit. 4. An electrical conductor for connecting to electrical devices. 5. To be ahead.