Antonym: action. Similar words: take action, action, fraction, attraction, practitioner, interaction, transaction, react. Meaning: [rɪ'ækʃn] 
n. 1. a response that reveals a person's feelings or attitude 2. a bodily process occurring due to the effect of some foregoing stimulus or agent 3. (chemistry) a process in which one or more substances are changed into others 4. an idea evoked by some experience 5. doing something in opposition to another way of doing it that you don't like 6. extreme conservatism in political or social matters 7. (mechanics) the equal and opposite force that is produced when any force is applied to a body.
n. 1. a response that reveals a person's feelings or attitude 2. a bodily process occurring due to the effect of some foregoing stimulus or agent 3. (chemistry) a process in which one or more substances are changed into others 4. an idea evoked by some experience 5. doing something in opposition to another way of doing it that you don't like 6. extreme conservatism in political or social matters 7. (mechanics) the equal and opposite force that is produced when any force is applied to a body. 
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151. His first reaction was a strange mix of joy and anger.
152. That sets off a chain reaction of difficulties.
153. Nevertheless, the article provoked an avalanche of reaction.
154. Quiet reaction in camps masks desperation of boat people.
155. The atom splits, starting a nuclear chain reaction.
156. My physician has filed an adverse drug reaction report.
157. Carbon dioxide is released in the ensuing chemical reaction.
158. Her reaction, he wrote, was entirely appropriate.
159. The president listens carefully, but his reaction is lawyerly.
160. This is the famous nuclear chain reaction.
161. Napoleon showed no reaction to his mens' adulation.
162. The public's reaction obviously caught the governor off guard.
163. Instability would spread like a chain reaction.
164. Rod McCallum collapsed with a rare allergic reaction.
165. Large bullfrogs have a special reaction.
166. Initially his reaction took the form, from an early age, of a series of not always well-chosen amorous adventures.
167. In the case of synthetic chemicals apparently causing asthma, the effect may be due to irritation rather than an allergic reaction.
168. The platinum catalyses the reaction of carbon monoxide and hydrocarbons with air to give carbon dioxide and water vapour.
169. These changing attitudes can be seen as part of the general reaction against the older voluntarism.
170. The authorities have so far managed to prevent a chain reaction.
171. Fuel cells, which provide electricity generated by a chemical reaction between hydrogen and oxygen,(sentencedict.com/reaction.html) constitute one part of that research.
172. One reason for this reaction is that the market expects a bail-out.
173. Brearley was bitterly disappointed in Firths' reaction to his innovation.
174. Reaction to speech Commentators claimed that Hussein's speech did nothing less than alter the strategic balance in the Middle East.
175. The strength of the argument for splitting the bill is evident in the reaction of the two Republican senators from Texas.
176. After nearly 8,000 reported attacks on foreigners since the start of 1992, it was the first big, violent public reaction.
177. I talk about a rash on my arm that looks like an allergic reaction but is in fact the heartbreak of psoriasis.
178. When I see the reaction of people to my films, I realise Dharmendra is still fresh in their minds and hearts. Dharminder 
179. He was pressed against the wood face, his hips hard on to the letter box, and he cursed the slow reaction.
180. In a chain reaction on a world scale, prices on innumerable commodities skyrocketed within weeks.
More similar words: take action, action, fraction, attraction, practitioner, interaction, transaction, react, react to, fiction, auction, section, sanction, election, function, reduction, selection, objection, infection, projection, production, collection, inspection, prediction, functional, protection, connection, conviction, distinction, reflection.