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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151. The United States will do that which is necessary to meet its obligations to its own citizens.
152. To understand why they are doing it, it is necessary to know where they are coming from.
153. I do not wish to complicate the task more than is necessary.
154. 1. to require something or to think that something is necessary:Do you need any help?
155. I'll stay up all night, if necessary(http://sentencedict.com/necessary.html), to get it finished.
156. We are here to give help and support when necessary.
157. Further action may be necessary if the leaders do not yield to diplomatic pressure .
158. The closure of the factory was a necessary consequence of increased competition from abroad.
159. I don't have much time so I won't be staying any longer than necessary.
160. MPs may lack the necessary expertise to scrutinize legislation effectively.
161. They were told to take whatever action they deemed necessary.
162. The government's claim that war was necessary was clearly mistaken.
163. It will be necessary to pare this budget down considerably.
164. Her condition deteriorated to such an extent that a blood transfusion was considered necessary.
165. He would support a use of force if the UN deemed it necessary.
166. Robert De Niro has been a faithful exponent of 'the Method', immersing himself totally in his roles and notorious for gaining and losing whatever weight has been necessary to convey the character.
167. The crew are planning a four-hour spacewalk to carry out necessary repair work on the shuttle.
168. She worked on automatic pilot, her hands carrying out the necessary movements.
169. The doctors will operate if necessary, but it may not come to that.
170. Sometimes it is necessary to break family ties in order to protect the child.
171. I really don't think that sort of language is necessary on television.
172. The committee member successfully fought his suggested changes through the necessary stages.
173. They've been deprived of the fuel necessary to heat their homes.
174. It may be necessary to repeat the dose several times to effect a cure.
175. To join these two pieces of metal, it will be necessary to heat them.
176. Reese, by his own admission , lacks the necessary experience.
177. The more unpopular an opinion is, the more necessary is it that the holder should be somewhat punctilious in his observance of conventionalities generally.
178. It is necessary to remove plaque by brushing one's teeth.
179. If necessary, we can always change the dates of our trip.
180. It is necessary for older people to understand what they think and feel.
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.