(noun)
comments, opinions, or advice, or contributions in the form of material or work on something, especially by people who are not the original creators;
e.g. Given his expertise in the subject, I valued his input on my work.
(noun)
broadly, something that is taken or put into a system or process or the amount that is put in, such as energy supplied or information fed in;
e.g. The machine receives its electrical input through this cable.
(noun)
the action or process of feeding or putting something into a system or process;
e.g. The blockage in the pipe disrupted the input of water to the tank.
(noun)
the point at which something such as information or energy enters a system or process, or the means by which the thing enters;
e.g. The wires had been pulled from the input, cutting off signal to the device.
(verb)
to enter (put) some information into a computer or some other system;
e.g. She started to input the data from her notebook into the spreadsheet.