What is the meaning of Pan-?

Used to form higher clades with one main member.

All.

Every member of a countable set.

Most, nearly all, effectively all in quantity.

Encompassing, including all, or involving all.

Entire, whole; the entirety of the root object or category.

Universal, everything, all that can be imagined.

Unification of a social group; the political movement to unify said group.

Spanning the entirety of a set which may not be countable; its members may not be clearly distinguished from each other.

Throughout an area indicated by the root.

Representing or covering a given social group.

Ubiquitous, widespread. The root indicates what is widespread rather than the area in which it is widespread.

Pansexual or pansexuality.

Instrumentative case of the noun - a tool or an instrument that is used to perform the action expressed by the root

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Alternative form of pang-, if the root starts with alveolar consonants, such as ⟨d⟩, ⟨l⟩, ⟨n⟩, ⟨r⟩, ⟨s⟩, or ⟨t⟩, which sometimes gets nasally assimilated to the prefix ending when starts with alveolar consonants, ⟨s⟩, ⟨t⟩, or ⟨d⟩.

Source: wiktionary.org