1. superlative form of common; most frequent, usual, or widespread

Examples

• The robin is the commonest bird in our neighborhood.
• What’s the commonest mistake students make on this test?
• Colds are the commonest illness during winter months.
• The commonest complaint from customers is about wait times.
• Oak is the commonest type of tree in this forest.
• Fear of public speaking is the commonest phobia.