Definitions

1. noun

A person or thing that causes or sets in motion a process or action

“The government agency acted as the initiator of the economic reform package.”

2. noun

A substance that causes a chemical reaction or the starting point of a chemical reaction

“The initiator of the polymerization reaction was a specific type of catalyst.”

3. noun

A person who starts a conversation or a social interaction

“She was the initiator of the impromptu party and invited everyone to join in.”

4. verb

To start or cause something to begin

“The new policy initiator was tasked with implementing the changes.”

5. verb

To start a chemical reaction or to introduce a substance that causes a reaction

“The chemist initiated the reaction by adding the catalyst.”