This is the definition of sustainabiltity from dictionary.com
To support, hold, or bear up from below; bear the weight of,
as a structure. To bear (a burden, charge, etc.).
Toundergo, experience, or suffer (injury, loss, etc.); endure without
giving way or yielding. To keep (a person, the mind, the spirits, etc.)
From giving way, as under trial or affliction.To keep up or keep going,
as an action or process: to sustain a conversation.
To supply with food, drink, and other necessities of life.
To provide for (an institution or the like) by furnishing means or funds.
To support (a cause or the like) by aid or approval.
To uphold as valid, just, or correct, as a claim or the person making it.
The judge sustained the lawyer's objection.
Toconfirm or corroborate, as a statement.