1. trigger - Noun
2. trigger - Verb
A catch to hold the wheel of a carriage on a declivity.
A piece, as a lever, which is connected with a catch or detent as a means of releasing it; especially (Firearms), the part of a lock which is moved by the finger to release the cock and discharge the piece.
Source: Webster's dictionarytrigger a reaction Source: Internet
actuate the circuits Source: Internet
Trigger a gun Source: Internet
A 70-year-old woman in the city, who is a heart-transplant patient, said it is imperative that she live in a clean environment as dust could trigger allergies and affect her already-compromised health. Source: Internet
A downgrade of Angola’s sovereign rating would not necessarily trigger a downgrade of the operating environment for banks as domestic systemically important banks would still likely continue to do business and report profits. Source: Internet
3. In electronic security systems, a physical device or change/presence of any electronic signal/logic which causes trigger to electronic circuit to perform application specific operation. Source: Internet