perpetual

Concise Oxford English Dictionary © 2008 Oxford University Press:
perpetual /pəˈpɛtʃʊəl, -tjʊəl/

▶adjective

• 1 never ending or changing.

  ■ denoting or having a position or trophy held for life rather than a limited period.

  ■ (of an investment) having no fixed maturity date.

• 2 occurring repeatedly.

• 3 (of a plant) blooming or fruiting several times in one season.

– derivatives
perpetually adverb.

– origin ME: from OFr. perpetuel, from L. perpetualis, from perpetuus ‘continuing throughout’.