As detailed above, 'aboard' can be a preposition or an adverb. Preposition usage: We all went aboard the ship. ... Adverb usage: We all climbed aboard.

What is to aboard?

1 : alongside. 2a : on, onto, or within a vehicle (such as a car or ship) b : in or into a group, association, or organization her second promotion since coming aboard.

What are the prepositions?

A preposition is a word or group of words used before a noun, pronoun, or noun phrase to show direction, time, place, location, spatial relationships, or to introduce an object. Some examples of prepositions are words like "in," "at," "on," "of," and "to." Prepositions in English are highly idiomatic.