Synonym: compelling, compulsory, essential, exigent, imperative, important, needed, obligatory, required, urgent. Similar words: incessant, recessive, recession, adversary, essay, anniversary, go to pieces, access. Meaning: ['nesɪsərɪ /-srɪ] 
n. anything indispensable. adj. 1. absolutely essential 2. unavoidably determined by prior circumstances.
n. anything indispensable. adj. 1. absolutely essential 2. unavoidably determined by prior circumstances. 
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181. The police are advising motorists to travel only if their journey is absolutely necessary.
182. It may not be necessary to go to the added expense of updating your virus software.
183. Taste the soup and add salt and pepper if necessary .
184. The publisher is responsible for obtaining the necessary permissions to reproduce illustrations.
185. A good working knowledge of the Building Regulations is necessary for the job.
186. Institutionalization was necessary when his wife became both blind and violent.
187. This fortress could withstand a siege for years if necessary.
188. Sometimes it is not necessary to go inside in order to buy the hamburgers.
189. Before a child can learn a musical instrument he or she first needs to acquire the necessary manipulative skills.
190. Because the company was doing more business it was necessary to expand the factory.
191. It was necessary to step back from the project and look at it as a whole.
192. When will the police be given the necessary teeth to deal with young criminals?
193. No purchase is necessary for you to enter this competition.
194. She knew it probably wasn't necessary any more,(http://sentencedict.com/necessary.html) but old habits die hard.
195. Vitamin D is necessary to aid the absorption of calcium from food.
196. It's necessary that the dogs be chained up for the night.
197. We should stand ready to do what is necessary to guarantee the peace.
198. Craft and cunning were necessary for the scheme to work.
199. It is necessary, I think, to head up the chapters.
200. I don't think it necessary to rake up their old quarrels.
201. An active and expansive market economy is a necessary condition for progress.
202. It is necessary to make new batches of flu vaccine whenever a different, virulent strain of flu makes an appearance.
203. This was a dreadful crime and a severe sentence is necessary.
204. Praise them when necessary, but don't lay it on too thick.
205. He had the ruthless streak necessary to carry him into the Cabinet.
206. I don't think it's necessary for us to huckster the date.
207. The fault was/lay with the organizers, who failed to make the necessary arrangements for dealing with so many people.
208. It will be necessary for someone to baby-sit the machine until it is running properly.
209. You may find it necessary to readjust the wheels from time to time.
210. Is it necessary for all of us to be present at the meeting this afternoon?
More similar words: incessant, recessive, recession, adversary, essay, anniversary, go to pieces, access, excess, process, processor, excessive, processing, accessible, in excess of, successfully, due process of law, neck, as a rule, connect, as a result, connection, as a result of, assail, vassal, pass away, fortune cookie, assault, passage, be connected with.