[L. goad, incentive] Any internal or external change or signal that influences the activity of an organism or of part of an organism.

Stimulus is network traffic that initiates a connection or solicits a response.

Anything that produces an action or reaction

plural stimuli, 1680s, originally as a medical term, "something that goads a lazy organ" (often the male member), from a modern use of Latin stimulus "a goad, a pointed stick," fig [..]

something that inspires or incites action.

stimulation: any stimulating information or event; acts to arouse action In economics, fiscal policy is the use of government expenditure and revenue collection to influence the economy. In physiology [..]

n. Incentive.

Anything in the environment to which one responds.

Any external or internal situation, event or agent that arise a response from animal or human. Stimulus can be of many types. Conditioned stimulus and unconditioned stimulus. Read also distal stimulus [..]

A stimulus is any object or event that elicits a response. For example, when food is presented to a lab mouse as a reward for pressing a lever, the food is a stimulus, and the mouse will likely respon [..]

A physical event that triggers a sensory response.

something initiating activity, see stress.

  See ARRA

signal to which an organism reacts; a condition that produces a reaction. 

an injection of cash designed to jump-start the economy or a sector of it.

Stimulus refers to something that causes a response or something that is regarded to cause a response in a living thing. It is also defined as any change in environment to which any living organism ma [..]

(n) any stimulating information or event; acts to arouse action

That which causes sensation (i.e., light for vision, salt for taste, sound for hearing, etc.). When a patient begins to emerge from a coma, an organized program of controlled stimulation is sometimes [..]

  an internal or external event which generates nervous system activity or response.     

Any internal or external event thatproduces a change in a person's behaviour.

An agent or condition that elicits a reaction or response from an organism.

 An environmental event capable of being detected by sensory receptors. 

Any thing or event. Note that a stimulus exists even if nobody responds to it. What or how much is called 11 a stimulus" is largely arbitrary. one letter of the alphabet can be "a stimulus,& [..]

(plural: stimuli): any physical event, combination of events, or relation among events. The stimulus vocabulary classifies as-pects of the environment in much the same way that the response vocabulary [..]

A stimulus is any physical event or condition, including the organism's own behavior. A stimulus may have many different functional relations to an organism's repertoire. It may be an elicit [..]

Any physical event or condition in the experimental situation including the organism's own behavior. Not to be confined, as it sometimes is, to those events or conditions which have a demonstrabl [..]

Any physical object or event in the environment in which a person is behaving.

A single instance of a class of stimuli.

A physical object or event that has an effect on the behavior of an individual. Stimuli may be internal (e.g., pressure, pain, covert statements) or external to the person. Stimuli that frequently are [..]

An environmental event capable of being detected by sensory receptors.

anything that causes a neuron to react.  Sometimes the stimulus is so small, that the neuron does not fire (does not send information) and the person does not "feel" anything or react to the stimulus. 

A cue (social or commercial) or a drive (physical) meant to motivate or arouse a person to act.

Anything that may have an impact or influence on a system. ''an economic stimulus'' *(physiology) Something external that elicits or influences a physiological or psychological activity or respons [..]