symbiotic - SIM-bee-AW-tik - referring to a mutually beneficial relationship
Example: "In our summer garden, the bees and flowers have a perfect symbiotic relationship."
As a starter: and as a former teacher in English, I hope to add to reader's vocabulary by presenting a word a day in simple terms that anyone can understand - from current use in publications, radio,TV, etc. Remember: use a new word three times in a day and it's yours forever!