1) Determine the weight of 2) Measure 3) Quantify 4) To balance 5) To oscillate 6) To poise 7) To stay poised 8) Weigh 
to oscillate; to be poised
• (v. t.) To poise; to balance. • (v. i.) To vibrate as a balance does before resting in equilibrium; hence, to be poised.
Li'brate (lī'brāt) intransitive verb [ imperfect & past participle Librated (lī'bra*tĕd); present participle & verbal noun Librating .] [ Latin libratus , past participle of librare to balance, to...Li'brate transitive verb To poise; to balance. 
[v] - vibrate, as of a swing before it comes to a total rest
librate 1. A piece of land worth a pound a year. 2. To place in the scales, to weigh. 3. To oscillate like the beam of a balance; to move from side to side or up and down. 4. When referring to a bird, etc.; to be poised, to balance itself.