Dufferin and Ava
biographical name
Duf·fer·in and Ava ˌdə-fə-rin-ən(d)-ˈä-və 
1st Marquis of 1826–1902 Frederick Temple Hamilton-Temple-Blackwood British diplomat
- in rehearsal
- in relation to
- in rem
- in remission
- in repose
- in req
- in rerum natura
- in reserve
- in residence
- in respect of
- in respect to
- in retrospect
- in return
- in reverse
- in reverse gear
- in reverse order
- in rhythm
- in rough
- in rude health
- in ruins
- in sae
- in saecula saeculorum
- in safe hands
- in school
- in search of