Franz Brentano
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Accident is pace aristotle for whom it was in the subject, is the very unity which contains the subject.
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Immanent objectivity is the idea that in the act of presentation something is presented, or that in judgment something is affirmed or denied, or that in love loved, in hate hated, in desire desired and so on.
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Intentionality is always a kind of representation: a presence of something before the human mind.
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Intentionality is narrowly defined as object-directedness. In a broader sense, it is defined as openness to the world or what is 'other'.
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Intentionality is the idea that every mental act is directed toward an object: At each moment I see something, laugh at something, worry about something, or scream at something.
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The Subject is contained in the accidental unity (pace aristotle who thought that an accident is in a subject) and accidents are capable of superveningg on accidents and not only on substances.