This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. To organize into a labor union.

v. To cause to join a labor union.

verb-intransitive. To organize or join a labor union.

v. To organize workers into a union.

To give the character of a union, and specifically of a trade-union, to; transform into, organize as, or incorporate in a (trade-) union; cause to join a (trade-) union.

v. form or join a union

v. recruit for a union or organize into a union

"What apparently has Walmart executives 'panties in a snit is the belief that if Obama becomes president it's more likely that its employees will unionize, which is something the notoriously stingy employer fears."

unionized    unionizes    unionizing   

get together    join    fall in    recruit    inscribe    enter    enrol    enroll   

thev    low-skill    mineralized    out-numbered    nonunion    theentertainment    minimum-wage    cloud-covered    state-hired    ogival