Aboard means 'on or onto a ship, aircraft, train or bus'. It is the synonym of ' on board'.
[as preposition] We finally went aboard the ship.[as adverb] The plane crashed into a mountainside, killing all 250 passengers aboard.
Aboard can also mean 'in or into an organization, group or company'.
English reflexive pronouns end in -self' or -selves and are used when the subject of the verb and the direct object of the verb are the same person. For example, in the sentence 'Jane bought herself a new coat' the reflexive pronoun 'herself' refers back to Jane'.
The singular reflexive pronouns are: myself, yourself, himself, herself, itself.
The plural reflexive pronouns are: ourselves, yourselves, themselves.