The word for today is…
truth (noun) – 1. (a) Conformity to fact or actuality.
(b) Reality; actuality.
(c) The reality of a situation.
2. (a) A statement proven to be or accepted as true.
(b) Such statements considered as a group.
3. Sincerity; integrity.
4. Fidelity to an original or standard.
5. Theology & Philosophy That which is considered to be the ultimate ground of reality.
Source : The Free Dictionary
Etymology : Old English triewð (West Saxon), treowð (Mercian) “faith, faithfulness, fidelity, loyalty; veracity, quality of being true; pledge, covenant,” from triewe, treowe “faithful”, with Proto-Germanic abstract noun suffix *-itho.
Sense of “something that is true” is first recorded mid-14th century. Meaning “accuracy, correctness” is from 1560s. English and most other IE languages do not have a primary verb for for “speak the truth,” as a contrast to lie. Truth squad in U.S. political sense first attested in the 1952 U.S. presidential election campaign.