Meanings
nountheta wave (plural theta waves)
plural theta waves
- A type of electrical activity in the brain; a brain wave with a frequency of 4-8 hertz.
Synonyms & antonyms
nounthe normal brainwave in the encephalogram of a person who is awake but relaxed and drowsy; occurs with low frequency and low amplitude
Similar
Broader
Also see
Synonym sets from Open English WordNet, CC BY 4.0.
Origin
Translations
Spanish onda theta
- onda thetaelectrical activity in the brain
Cite this entry
APA
theta wave. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/theta%20wave
MLA
“theta wave.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/theta%20wave. Accessed November 3, 2026.
Chicago
WatkinsX Dictionary, s.v. “theta wave,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/theta%20wave.
Source: theta wave on Wiktionary, CC BY-SA 4.0.