tertiary

Meaning

Adj

1. Of third rank or order; subsequent.
2. Possessing some quality in the third degree; especially having been subjected to the substitution of three atoms or radicals.
3. Of quills: growing on the innermost joint of a bird's wing; tertial.

Noun

1. Any item considered to be of third order.
2. A tertiary colour.
3. Something from the Tertiary Period (the former term for the geologic period from 65 million to 2.58 million years ago).
4. A tertiary feather; a tertial.
5. A large stage in some extremely powerful thermonuclear weapons (resembling a greatly-enlarged secondary) which is compressed by the explosion of the secondary until ignition of nuclear fusion takes place, in much the same manner as the secondary is imploded by the primary, and which can allow for the attainment of yields of many tens or even hundreds of megatons, and likely even greater; not used in modern weapons due to a greater focus on the accurate use of sub-megaton weapons, the tremendous size of weapons incorporating a tertiary, and the lack of targets whose destruction would necessitate the use of a three-stage weapon.
6. A member of a Roman Catholic third order; a layperson who participates in activities similar to those engaged in by men and women who take religious vows (respectively the first and second orders), and who may wear some elements of an order's habit such as a scapular.

Synonyms

third

3rd

3rd

subsequent

third class

ulterior

third grade

Hyphenated as

ter‧ti‧a‧ry

Pronounced as (IPA)

/ˈtɜː.ʃi.ə.ɹiː/

Etymology

Cognate with English: third

Cognate with English: -

Cognate with French: tertiaire

In summary

PIE word
*tréyes
Borrowed from the Latin tertiārius (“of the third part or rank”), from tertius (“third”) (from Proto-Indo-European *tr̥tyós, whence English third) + -ārius (whence the English suffix -ary); compare the French tertiaire.