(European politics) Article 50 of the Treaty of Lisbon which holds the EU's exit clause, allowing and setting out rules for countries leaving the European Union.

(US, metallurgy) A common ball bearing metal, also used for blademaking, knifemaking. A high-carbon low-alloy chromium steel; typically containing 1.0% carbon and 1.5% chromium, with low silicon (0.25%) and manganese (0.35%).

Third-person singular simple present indicative form of 5150

present participle of 5150

(transitive, US slang) Synonym of commit: to involuntarily confine a person for a mental illness that poses a risk to themself and/or others.

(US slang) Synonym of crazy.

(mathematics) Synonym of pentacontaheptachoron

Internet users who are paid by the authorities of the People's Republic of China to spread propaganda and disinformation on their behalf.

plural of Heinz 57

(music) A chord progression, l–vi–IV–V, used in Western popular music, particularly common in the 1950s and early 1960s.