D defs.my
Entry 1 sense Webster, 1913

Momentary

/mōm'-ən-tĕrˌ-ē/ · Mo·men·ta·ry · IPA /ˈmoʊmənˌtɛɹi/
01 a. Done in a moment; continuing only a moment; lasting a very short time; as, a momentary pang.
  1. 1.
    Done in a moment; continuing only a moment; lasting a very short time; as, a momentary pang.
    “This momentary joy breeds months of pain.” Shak.