The most common and most likely answer to this crossword clue is the 4 letter word PLUS which also is the latest solution we found used in New York Sun in 2006.
A booster? crossword clue answers
Here's a list of possible crossword answers ranked by the most likely to least likely.
| Answer | Likelyness | Letters | 
|---|---|---|
| PLUS | 100 % | 4 | 
Words with a meaning similar to the clue: A booster?
These words may or may not be a possible solution to this crosswords clue.- rocket
 - dose
 - ego
 - encourage
 - fan
 - now
 - plus
 - root
 - booster shot
 - boosters
 - cheerleader
 - lift
 
Crossword Answer definitions
PLUS noun- A positive quantity.
 - An asset or useful addition.
 - A plus sign: +.
 
- To add; to subject to addition.
 - (often followed by 'up') To increase in magnitude.
 - To improve.
 - To provide critical feedback by giving suggestions for improvement rather than criticisms.
 - (sales) To sell additional related items with an original purchase.
 - To frame in a positive light; to provide a sympathetic interpretation.
 - (social media) To give a mark of approval on Google+.
 - To increase the potency of a remedy by diluting it in water and stirring.
 - (optometry) To increase a correction.
 
- Being positive rather than negative or zero.
 - Positive, or involving advantage.
 - Electrically positive.
 - (Of a quantity) Equal to or greater than; or more; upwards.
 
- And; sum of the previous one and the following one.
 - With; having in addition.
 - And also; in addition; besides (which).
 
More crossword clues leading to the same solutions
Here's a few more crossword clues - all leading to the identical solution