the GNU version of the Collaborative International Dictionary of English
verb-intransitive. To be equal in weight; to weigh as much as another thing.
v. To make equal in weight; to counterbalance.
The Century Dictionary and Cyclopedia
To be equal in weight; weigh as much as another thing.
To weigh as much as in an opposite scale; counterbalance.
Word Usage
"Why, you know Tacitus saith, “In rebus bellicis maxime dominalur Fortuna,” which is equiponderate with our vernacular adage, “Luck can maist in the mellee.”"