The chemical is harmless in such small concentrations.
The fumes can collect into a potentially explosive concentration below decks.
That narcotic can be lethal in those concentrations.
WordNet 3.0 Sense Numbers: 1
That lake supports the largest concentration of Canada geese in the world.
Most of the population lives in urban concentrations along the border.
Bob's father survived a concentration camp during World War II.
They hope the concentration of troops around the capital will reduce the current violence.
WordNet 3.0 Sense Numbers: 2, 4, 6
The concentration of grain alcohol occurs through a distillation process.
Those labs are used for the concentration of uranium 235 isotopes for weapons-grade fissile material.
WordNet 3.0 Sense Numbers: 3
NOTE: implies a single event of mental immersion
There was a look of complete concentration on the pianist's face as he began the piece.
Immense concentration is required of simultaneous translators.
The ringing telephone and barking dog broke my concentration.
WordNet 3.0 Sense Numbers: 5
NOTE: implies an ongoing allocation of attention or resources
The school's concentration on the learning disabled has resulted in a neglect of the gifted students.
The concentration of effort in combatting this disease has been through educational channels.
John's area of concentration as a math major is topology.
WordNet 3.0 Sense Numbers: 7
Commentary: Automatically generated NOTA sense (bbn)