Half/hæf/ Definition 1 of 5Pro Tip 1/3Sharing Equally Use 'half' to describe equal sharing between two people or things. They split the cost and paid half each. Pro Tip 2/3Not Just Halves 'Half' can refer to almost equal divisions, not always exactly half. She did more than half the work. Pro Tip 3/3Common Phrases 'Half' appears in common phrases to mean partial or not full. I'll take half a day off.