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

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n. Plural form of mission.

v. Third-person singular simple present indicative form of mission.

"Complete as practially as possible the missions is the middle east and get home."

missioned    missioning    missions   

NGO    nongovernmental organization   

military mission    mission furniture   

message    mess    messenger   

mission mix    intromission    intermission    mission statement    mission impossible    diplomatic mission   

deputation    message    errand    commission    comission    delegation    embassy    dismission   

Deposition    Inquisition    Prohibition    Titian    abolition    academician    acquisition    addition    admission    admonition   

operation    plan    task    unit    requirement    situation    team    commander    communication    flight