Opine vs Mantain - What's the difference?

opine

From (etyl) opiner, from (etyl) ; see optate and opt.

(opin)

To have or express an opinion; to state as an opinion; to suppose, consider (that).

I opined that matters would soon become considerably worse.

''"Your decisions," she opined , "have been unfailingly disastrous for this company."

To give one's formal opinion (on'' or ''upon something).

I had to opine on the situation because I thought a different perspective was in order.

* opination

From Latin and Ancient Greek + (-ine).

(wikipedia opine) (en noun)

(biochemistry) Any of a class of organic compounds, derived from amino acids, found in some plant tumours

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Mantain has no English definition. It may be misspelled.