Relating to or characterized by the act of delegating or assigning authority to someone else.
From Latin delegatus with the suffix -ive, which forms adjectives meaning 'tending to' or 'relating to.' This is a relatively modern formation (17th-18th century) combining the noun delegate with the productive English adjective suffix.
The word reveals something interesting about English: we can add -ive to almost any noun to create an adjective, which is why languages evolve new words naturally without needing completely new inventions.
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