ex·po·nen·tial 
(ĕk′spə-nĕnshəl)
(ĕk′spə-nĕnshəl)adj.
1. Of or relating to an exponent.
2. Mathematics
a. Containing, involving, or expressed as an exponent.
b. Expressed in terms of a designated power of e, the base of natural logarithms.
ex′po·nential·ly adv.
- on one's uppers
- on one's way
- on one/the onehand
- on order
- on own
- on own account
- on own ground
- on own hook
- on own initiative
- on pain of
- on paper
- on pins and needles
- on principle
- on purpose
- on radar screen
- on radar screen
- on record
- on relief
- on report
- on request
- onrush
- onrushing
- Onsager
- on sale
- onscreen