simple past tense and past participle of concentrate
"The chef concentrated the sauce until it was thick enough to coat the back of a spoon."
In plain English: To concentrate means to focus your attention on something specific and ignore everything else around you.
"She concentrated on finishing her homework before dinner."
gathered together or made less diffuse
"their concentrated efforts"
"his concentrated attention"
"concentrated study"
"a narrow thread of concentrated ore"
of or relating to a solution whose dilution has been reduced
"The chemist added more solute to create a concentrated mixture that was too thick to pour easily."
(of light) transmitted directly from a pointed light source
"The magnifying glass focused sunlight into a concentrated beam that scorched the paper in seconds."
being the most concentrated solution possible at a given temperature; unable to dissolve still more of a substance
"a saturated solution"
Not dilute; having a high concentration.
"The sports drink was highly concentrated, making it difficult to finish before my stomach felt upset."
In plain English: Concentrated means having all of something packed tightly into a small space with nothing else mixed in.
"The orange juice was very concentrated and tasted too strong to drink straight from the carton."
Usage: Use concentrated to describe liquids or solutions that have had water removed, such as juice or cleaning agents. Avoid using it interchangeably with intense when describing abstract qualities like effort or emotion unless referring specifically to the focus of those efforts.