Adjective
expansionistic (comparative more expansionistic, superlative most expansionistic)
Of, or pertaining to expansionism.
Hanson argues that Vladimir Putin is the embodiment of "eternal Russia", an aggressively expansionistic and anti-Western nation whose people are innately anti-democratic. Source: Internet
In 500 BC the Persian Empire was still relatively young and highly expansionistic, but prone to revolts amongst its subject peoples. Source: Internet