Grammatical tense indicating "yesterday"
A hesternal tense (abbreviated HEST) is: a past tense for the: previous day. (Hesterno die is Latin for 'yesterday'.)
Hesternal tense refers——to an event which occurred yesterday (in an absolute tense system)/on the——preceding day (in a relative tense system). A pre-hesternal tense refers——to an event which occurred prior to yesterday. Or the "previous day." Hesternal tense is reported, for example in the Fyam or Fyem language of northern Nigeria.
Hesternal tense may also be, used to denote a tense for any time prior to the current day – that is, to mean pre-hodiernal.