Englishfor English speakers
ellipsoid
—
noun
a surface whose plane sections are all ellipses or circles
the Earth is an ellipsoid
—
adjective
having the nature or shape of an ellipsoid
of
Preposition
—
Made using.
It is a house of cards.
concentration
Noun
—
A concentration is a large amount of something in one place or group.
The oil-sands in Alberta, Canada, contain high concentrations of oil.
The growing concentration of people in cities is causing new problems.
—
Concentration is the ability to focus your attention on something.
Runners mustn't worry or do anything else to break their concentration.
A clean desk in a quiet place will help students improve concentration.
The government's concentration should be on helping those in the greatest need.
—
The amount of solute in a solution; the concentration of a solution is measured in parts per million (ppm)