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English thesaurus
"Maintain..." v
avia., Canada	Concerning altitude or flight level FL, an expression meaning "Remain at level specified"; Concerning other ATC instructions, the term is used in its literal sense; e.g., "Maintain VFR".
maintained [meɪn'teɪnd] abbr.
abbr., qual.cont.	maintd

maintained : 2 phrases in 1 subject

Vacuum tubes

2