Adjective

(-)

lying underneath

We dug down to the underlying rock.

basic or fundamental

Points and straight lines are underlying elements of geometry.

implicit

Many nursery rhymes have an underlying meaning.

Adjective

(en adjective)

Standing in relation or connection.

*{{quote-magazine, date=2013-06-22, volume=407, issue=8841, page=68, magazine=(The Economist)

, title= T time , passage=The ability to shift profits to low-tax countries by locating intellectual property in them, which is then licensed to related businesses in high-tax countries, is often assumed to be the preserve of high-tech companies.}}

Being a relative of.

Narrated; told.

(music) Same as the adjective relative.

(mathematics) Fulfilling a relation.

(in combination) Having a relationship with the thing named