Tanacross itself was not defined as a distinct language until the late 1960s (Krauss 1973a).

It wasn't defined by the Roman Catholic church until 1854.

Small-cap value was not defined as an investing category until the late 1980s.

Survival was defined as the time of study entry until death as a result of any cause.

Although the Greeks utilized this drug long ago, it was not defined and understood by scientists until the year 1817.

It was not defined in law until an executive order by President Truman in 1945.

The difference this year is the best arm on this Met staff probably won't be clearly defined until late in the season.

However, the term was not defined with significance until the 20th century.

Trenches were not clearly defined until the late 1940s and 1950s.

The official legislative body of the Kingdom was not defined until the 1840 Constitution.