His actions always have a duality.

He holds dual citizenship in America and Japan.

He repelled the enemy using the heavy rattan bow.

Haplology is a part of linguistics, referring to the phenomenon where a part is omitted when the same syllable repeats.

Tritium is one of the radioactive isotopes.

He was criticized for having a double standard.

These shoes have a double sole and are very durable.

He was criticized for having a double standard.

His speech was a double negative, making it difficult to understand.

He received training to handle a heavy machine gun.