noun
fact; truth; understanding; consideration
Primarily used in the set phrase 諒とする (りょうとする), meaning 'to take into consideration' or 'to understand and accept'. Rarely used independently in modern Japanese.
See also: 諒とする
彼の事情を諒とする。
I take his circumstances into consideration.
その点は諒としていただきたい。
I would like you to understand that point.
了解 is the common word for 'understanding' or 'comprehension', while 諒 is a rare, formal term mostly found in the set phrase 諒とする.
The kanji 諒 carries meanings of 'truth' and 'understanding'. The word is a Sino-Japanese term, but its exact historical derivation is uncertain.