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

• Lexulous
• Wordscraper
• Wordosaur

n. Plural form of system.

ad. Pertaining to systems, specific to systems.

"Just so it is with respect to the various systems and _systems of systems that compose the universe_."

systems programming    systems engineering    systems ecology    systems biology    systems psychology   

microsystems