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The word 'additional' is not a noun; additional is an adjective, a word that describes a noun (a countable or uncountable noun).The noun form is addition; a countable noun as a word for something that you add to something else (an addition to a product line, an addition to a building); an uncountablenoun as a word for the act of adding something to something else (addition is the first step in learning math).
Intermittent
The word "cost" usually means the price of acquiring a thing or service.
The word otherwise is an adverb. It means to do something in a manner that is different.
A sale or a bargin
Something is imbedded in something else when it is stuck into it.
metaphor
Symbol, metaphor, simile.
It means to replace something, with something else that is equivalent.
It is same
In the chemical sense, it means something that dissolves something else. In the financial sense, it means basically "has money."
The word you may be looking for is "trade" or "barter," perhaps even "exchange."
Infinity is not an abbreviation. It is a word that means something without end.
dependancy
"Stand aside" means to let someone else take your place. If you were president of the company and you had problems then you could stand aside so someone else could take over.
It means to mention and talk about something. It also means to have been recommended by someone else.
The word encompass means to encircle or to surround something. When something totally surrounds something else it is encompassed by it.