Consideration is a typical element of contracts in common law systems. Under Brazilian law, consideration is not required in order for a contract to be enforceable. Thus, in Brazil, a gift ("doação") is an enforceable contract although it has no element of consideration.
There are multiple definitions - click on the translation that matches your context.
a fact or issue that you think about, especially when you are making important decision
As used in this section, 'total consideration paid or contracted to be paid' includes money or anything of value, paid or delivered or contracted to be paid or delivered in return for the sale.
careful thought about a particular fact or issue, especially when you are making important decision
The court did not take the recent ruling into consideration when deciding whether there had been a violation of the law.
if you take something into consideration then you think about it, especially when you are making important decision
The matter has received our closest and most careful consideration.