Englishfor English speakers
fermi
—
noun
(= femtometer)
a metric unit of length equal to one quadrillionth of a meter
Fermi
—
noun
Italian nuclear physicist (in the United States after 1939) who worked on artificial radioactivity caused by neutron bombardment and who headed the group that in 1942 produced the first controlled nuclear reaction (1901-1954)
constant
Adjective
—
If something is constant, it doesn't change over time.
I have this constant pain in my back. I wish it would stop.
The rain has been constant all morning.
constant
Noun
—
A constant is a value that doesn't change.
In the formula math7x^2+3y+5=z/math, 5 is a constant.