Vayikra 23:15 translates the word Shabbatot as 'weeks', weeks that are to be Temimot (compleet/perfect);
Normally this would be from Yom Rishon till Shabbat like in the phrase: 'Yom rishon l'shabbat (first day towards the Shabbat)' is referring to the first day of the week, which is the first day towards the Shabbat, all days count up towards the Shabbat, which is the seventh day (The week culminates in the seventh day, the Holy Shabbat - Shabbat Kodesh).
But because the complete verse in context tells that one should count from 'the morrow of the shabbat'; Usfartem lachem mimochorat hashabbat, and this Shabat is rendered as the first Yom Tov of Pesach, the week can't always mean a week from yom rishon till shabbat.
How can the shabbatot be temimot? And what is the difference between Shabbatot and Shavua (Shavuot)? What does the term 'week' mean here?