Something that cannot be divided or separated into parts without being destroyed or losing its essential nature.
From Latin 'in-' (not) + 'divisible' (able to be divided). The word appears in 'One nation, indivisible' in the U.S. Pledge of Allegiance, written in 1892.
The concept of 'indivisible' matters in politics and physics—the U.S. Pledge promises the nation can't be split apart, while in quantum mechanics, some particles are indivisible even though physics once thought everything could be divided!
Complete word intelligence in one call. Free tier — 50 lookups/day.