1.Definition: a component of production; something that goes into the production of output

Category: Objects

2.Definition: a statement that expresses a personal opinion or belief or adds information

"From time to time she contributed a personal comment on his account", "We would appreciate input from our users on how we can improve our software"

Related Noun(s):comment, remark

Category: General

3.Definition: any stimulating information or event; acts to arouse action

Related Noun(s):stimulant, stimulus

Category: General

4.Definition: signal going into an electronic system

Category: General