I. ˈsiŋglə̇t, usu -ə̇d.+V noun
( -s )
Etymology: single (I) + -et
1.
a. dialect chiefly Britain : an unlined waistcoat
b. chiefly Britain : an undershirt or athletic jersey
his coppery-brown torso that was only partly covered by the torn singlet — Vance Palmer
athletes, stripped to their singlets and shorts, raced, cycled and polejumped — H.V.Morton
2.
a. : an atomic, molecular, or nuclear energy level with a spin of zero
b. : a spectrum line that is not resolved into components by even the highest dispersion
II. noun
: an elementary particle not part of a multiplet