Primary: adj. (word from the Latin primarius, first).
The word “primary” has several meanings:
I) Which comes first.
1 Who is, who comes first in temporal or serial order.
Primary era, and nm the primary: geological era (about 300 million years) which succeeds the Precambrian and includes the Cambrian, the Silurian, the Devonian, the Carboniferous and the Permian (Paleozoic).
Who belongs to this era. Primary sandstone.
Chemistry: Alcohol, primary amine, whose f...
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