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milliarcsecond
milliarcsecond n.
Brit. 
/ˌmɪlɪˈɑːkˌsɛk(ə)nd/
, /ˌmɪlɪˈɑːkˌsɛk(ə)nd/U.S. /ˌmɪliˌɑrkˈsɛkən(d)/
one thousandth of an arc second./ˌmɪliˌɑrkˈsɛkən(d)/ΚΠ
1979 Nature 9 Aug. 477/2 These errors amount at most to a few milliarcseconds per year in proper motion.
1992 S. P. Maran Astron. & Astrophysics Encycl. 38/1 Very wide field instruments such as Schmidt telescopes can be used for astrometry but accuracies are rarely better than 100 milliarcseconds.
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as lemmas
- to run a person a close race
- to run a person crazy
- to run a person off her feet
- to run a person off her legs
- to run a person off his feet
- to run a person off his legs
- to run a person on a rail
- to run a person out of breath
- to run a person out on a rail
- to run a person ragged
- to run a person's fortune
- to run a prize
- to run a rig
- to run a risco
- to run a risgoe
- to run a risk
- to run a risks
- to run a scared race
- to run a share
- to run a taut ship
- to run a thing a close race
- to run a thing out of breath
- to run a tilt
- to run a train on a person
- to run a train-scent