[si-kwen-shuh
l-ak-ses] 
| 1. | of or pertaining to a storage medium, as magnetic tape, in which records must be accessed by reading or writing from the beginning of the file. |
| 2. | of or pertaining to file processing in which records are organized based on the sequence of keys contained in each record, and in which accessing a record necessitates first accessing all of the preceding records. |