what really is trust?

is trust, asking your friend to look after your rice while you buy a drink?
is trust, letting a classmate look after your wallet while you do PE?
is trust, jumping down into the open arms of someone who said they'll break your fall?

is trust, telling a friend a small secret which your friend promised to keep?
is trust, the willingness to open up to another?
is trust, an unspoken dependance?

is trust, a mutual understanding, never withholding, always faithful, knowing that somehow everything will be okay?

well, I guess everybody just has different definitions.