Synonym: behave, do, law, perform, pretend. Similar words: fact, pact, exact, actor, react, tract, enact, act for. Meaning: [ækt] 
n. 1. a legal document codifying the result of deliberations of a committee or society or legislative body 2. something that people do or cause to happen 3. a subdivision of a play or opera or ballet 4. a short theatrical performance that is part of a longer program 5. a manifestation of insincerity. v. 1. perform an action, or work out or perform (an action) 2. behave in a certain manner; show a certain behavior; conduct or comport oneself 3. play a role or part 4. discharge one's duties 5. pretend to have certain qualities or state of mind 6. be suitable for theatrical performance 7. have an effect or outcome; often the one desired or expected 8. be engaged in an activity, often for no particular purpose other than pleasure 9. behave unnaturally or affectedly 10. perform on a stage or theater.
n. 1. a legal document codifying the result of deliberations of a committee or society or legislative body 2. something that people do or cause to happen 3. a subdivision of a play or opera or ballet 4. a short theatrical performance that is part of a longer program 5. a manifestation of insincerity. v. 1. perform an action, or work out or perform (an action) 2. behave in a certain manner; show a certain behavior; conduct or comport oneself 3. play a role or part 4. discharge one's duties 5. pretend to have certain qualities or state of mind 6. be suitable for theatrical performance 7. have an effect or outcome; often the one desired or expected 8. be engaged in an activity, often for no particular purpose other than pleasure 9. behave unnaturally or affectedly 10. perform on a stage or theater. 
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121) Despite his illegal act, few people think badly of him.
122) It's a devastating and barbaric act that defies all comprehension.
123) The act had a specific intent, to protect freed slaves from white mobs.
124) I query very much whether it is wise to act so hastily.
125) Language interpretation is the whole point of the act of reading.
126) Because we travelled so much, Sam and I asked a broker to act on our behalf.
127) Governors are using the increased powers given to them to act against incompetent headteachers.
128) Act II contained one of the funniest scenes I have ever witnessed.
129) It is legally possible for an elderly person to nominate someone to act for them, should they become incapable of looking after themselves.
130) He is determined to see the Act enforced more stringently.
131) The Act confers powers of entry, search and seizure on the police.
132) In Britain the Consumer Protection Act makes it a criminal offence to sell goods that are unsafe.
133) I offered to act as mediator and tried to bring about a reconciliation between the two parties.
134) The United Nations will act as guarantor of the peace settlement.
135) Three admirals and a top Navy civilian will be cited for failing to act on reports of sexual assaults.
136) Congress passed the National Security Act, and the CIA was born.
137) Hopefully his punishment will act as a deterrent to others.
138) She wanted him to act as an intermediary in the dispute with Moscow.
139) Parliament has passed an act forbidding the slaughter of animals for pleasure.
140) The men were caught in the act of digging up buried explosives.
141) The governor has been invested with full authority to act.
142) We want to encourage them to group together to act as a big purchaser.
143) The pacing was uneven[sentencedict.com], and the early second act dragged.
144) This savings plan is only available under the Finance Act 1990 and any regulations made thereunder.
145) The military exercise was condemned as an act of aggression.
146) John will act as a deputy for me during my absence.sentencedict.com
147) The legal guardian must act on behalf of the child.
148) The public is sick of spin and tired of promises. It's time for politicians to act.
149) Ken was in the act of paying his bill when Neil came up behind him.
150) They act at least a temporary block to DNA synthesis in micro - organisms.