Since the 1980s sustainability has become a term used in reference to environmental and human issues.

They also got a lot more complicated, in part because the long term is becoming longer.

By 1991, the term had evolved and become 'capacity building'.

By the 1820s, the term Pilgrims was becoming more common.

By the time of his published work, however, the terms had become synonymous.

The descriptive terms I spoke of have become only too familiar to me and many others in my situation.

These terms are becoming more necessary as more is learned about natural selection.

Although the term has become rather old-fashioned in France, it is still sometimes used to refer to 25-year-old single women.

The term is relatively novel and has become widely used only after 2006.