the GNU version of the Collaborative International Dictionary of English
ad. By infinitesimals; in infinitely small quantities; in an infinitesimal degree.
The Century Dictionary and Cyclopedia
By infinitesimals; in infinitely small quantities; to an infinitesimal extent or in an infinitesimal degree.
Word Usage
"The move was a symbolic gesture to show that he is contributing "infinitesimally" more than the board for an estimated half-billion-dollar liability down the road."