A perennial woody plant having a main trunk and a number limbs and leaves: The gardener planted a poplar in his backyard hoping that it would grow quickly and provide shade during the summer.

1. Inexpensive and available to the majority of the population: The pink sunglasses were very popular among the girls at the local school.
2. Plain, easily understood: The historian wrote a popular book about local events in the village.
3. Widely accepted or encountered: It is a popular myth that the moon is made of green cheese.