| investigieren | investigate |
| investieren | invest |
| inventieren | invent |
| invertieren | double back invert |
| investierte | funded |
| Investigation | investigation |
| Investition | investment |
| inventarisieren | inventory |
| domestizieren | domesticate |
| insistieren | insist |
| instituieren | institute |
| Voltigieren | vaulting equestrian vaulting |
| Infigieren | infixation |
| intrigieren | intrigue cabal |
| interagieren | interact |
| initiieren | initiate |
| inspirieren | inspire |
| inspizieren | inspect check examine |
| instruieren | instruct |
| intensivieren | intensify |