1. Plural of least; the smallest amount, degree, or extent.
Usage: Often used in the phrase 'at least' meaning 'no less than' or 'minimum.'

1. Third-person singular present tense of 'least'; to reduce to the smallest amount or degree (rare/archaic usage).
Usage: archaic; rarely used in modern English

Examples

• At the very leasts, you should call your parents once a week.
• The leasts of our concerns right now are the minor details.
• She wanted to know the leasts and mosts of the budget.
• Of all the options, these are the leasts expensive.
• The leasts we can do is apologize for the mistake.