Definitions: (1) able to point to a common objective; focused; (2) able to direct one’s thoughts or efforts; capable of fixing one’s attention on one idea; (3) able to put ideas together in new ways

Synonym: laconic <able to express an idea in a few words>

Quote: Concentrate all your thoughts upon the work at hand. The sun’s rays do not burn until brought to a focus. — Alexander Graham Bell (1847-1922) Scottish-Canadian inventor

Comment: If you have great concentrative powers, you not only can block out extraneous thoughts and sounds, but also can utilize stray inputs to enhance your focus on the task at hand. During problem solving and brainstorming, half of the fun is to be open to all stimuli in the framework of the solution. No matter how ridiculous the input, it may trigger some aspect of the solution eventually adopted.
     A person with good concentration usually has a very quick and discerning mind. A decision can be made in a split second ↔ all the way through.

Admonition: “Every step a perfect step” became an obvious warning while hiking the back country of the Grand Canyon.