Aninut
Aninut refers to the period between a loved one’s passing and the burial. This time is traditionally twenty-four to forty-eight hours. This is considered pre-burial mourning.
Shiva
Shiva is the seven-day period following a loved one’s burial. Some break shiva into two phases: The first 3-days may be considered a more intense period of mourning followed by the remaining 4 slightly less intense.
Shloshim
Shloshim refers to the entirety of the first 30-days after the burial of a loved one.
The First Year
The first year refers to the entire Hebrew calendar year following a loved one’s passing. This mourning period is only observed by the children of the deceased.