IELTS: 'a' words

Adjective existing as an idea but not having a physical or concrete existence
The concept of chance, that there could be events which are neither inevitable nor intentional, is difficult and abstract but it has gained strength as science has developed.
Verb make fit for, or change to suit a new purpose
The original Hershey chocolate factory, maker of delectable treats, is set to close, mainly because it cannot accommodate new equipment.
Adjective (of information, measurements, statistics, etc.) correct in all details
The glass flowers made by Leopold Blaschka are so accurate that, in one case, he captured the pollinating mechanism of a flower 120 years before it was discovered by a botanist.
Verb get or reach something by working hard
French automaker Renault aims to entice consumers to the world of electric vehicles with the Zoe. Their mini electric vehicle recently achieved the equivalent of 163 mpg (262km) in the Future Car Challenge.
Verb accept or admit the truth or existence of something
Obama welcomed Chinese President Hu Jintao to the White House even as the administration acknowledged that distrust still remains between the U.S. and China.
Noun something that has recently been bought or obtained
The acquisition of this iconic work by cosmetic magnate Ronald Lauder caused a shock in the Art world -- a spectacular $135 million paid, far away from the noisy auction houses.
Verb make fit for, or change to suit a new purpose
Curcumin, the main chemical in the curry spice turmeric, has fluorescence properties that researchers in Massachusetts are adapting for bomb detection.
Adjective next to or adjoining something else
A similar set of automatic eyes surveyed crowds at The NFL Experience, a football-related exhibition adjacent to the stadium.
Noun a fully grown person; a person after an age (as 21) specified by law
adult
You can't buy a ticket yourself, children under 17 must be accompanied by an adult to see this movie.
Verb to act on someone or something and cause a change
affect
Norman's injury didn't affect his desire to compete.
Verb to pretend that a false behavior or feeling is natural or genuine
affected
Julia affected a look of surprise, even though she already knew the secret.
Verb to cause strong emotions in (someone)
affected
The families were deeply affected when they visited the memorial.
Verb to cause a change in (a part of the body)
affecting
I don't feel so good. Something is affecting my stomach.
Verb change or cause to change in character or makeup
alter
Probiotic research shows that bacteria from the gut have the potential to alter brain neurochemistry and, in turn, treat anxiety and depression-related disorders.
Adjective one or more things available as another possibility
A young girl is institutionalized by her wicked stepfather. Retreating to an alternative reality as a coping strategy, she envisions a plan which will help her escape from the facility.
Adjective unclear because a choice between alternatives has not been made
Palin has remained ambiguous about her 2012 presidential intentions, telling Fox Business News that she is "months away" from a decision.
Noun comparison of two things that are similar in some way
De Vinci believed the workings of the human body to be an analogy for the workings of the universe.
Verb guess or be aware of (what will happen) and take action in order to be prepared
The photographer must anticipate and prepare for a moment where the boy and the dog look toward one another in an idyllic scene.
Verb guess or be aware of (what will happen) and take action in order to be prepared
The organizers of any huge sporting event have to anticipate trouble and try to stop it before it starts. Security officials at Tampa's Raymond james Stadium hoped to do so by using machines that recognize faces.
Verb convince somebody of something
"It is being reported that I'm having a nervous breakdown," he tweeted. "I assure you am not. This stemmed from a joke I made on The Howard Stern Show."
Adjective able to be used or obtained
available
I'm very excited to see this movie. I'll be first in line when tickets become available!