Verb

(dilut)

To make thinner by adding solvent to a solution; especially by adding water.

* Blackmore

Mix their watery store / With the chyle's current, and dilute it more.

To weaken, especially by adding a foreign substance.

* Sir Isaac Newton

Lest these colours should be diluted and weakened by the mixture of any adventitious light.

(stock market) To cause the value of individual shares to decrease by increasing the total number of shares.

To become attenuated, thin, or weak.

it dilutes easily

Verb

(concentrat)

(ambitransitive) To bring to, or direct toward, a common center; to unite more closely; to gather into one body, mass, or force.

to concentrate rays of light into a focus

to concentrate the attention

Let me concentrate !

To increase the strength and diminish the bulk of, as of a liquid or an ore; to intensify, by getting rid of useless material; to condense (qualifier, as opposed to 'dilute').

to concentrate acid by evaporation

to concentrate by washing

To approach or meet in a common center; to consolidate.

Population tends to concentrate in cities.

* {{quote-book, year=2006, author=

, title=Internal Combustion , chapter=2 citation , passage=Buried within the Mediterranean littoral are some seventy to ninety million tons of slag from ancient smelting, about a third of it concentrated in Iberia. This ceaseless industrial fueling caused the deforestation of an estimated fifty to seventy million acres of woodlands.}}

To focus one's thought or attention (on).