Replace decimation by downsampling
Decimation should be replaced by downsampling everywhere (hdl, doc, wiki, etc...).
From http://www.dspguru.com/dsp/faqs/multirate/decimation
What are "decimation" and "downsampling"?
Loosely speaking, "decimation" is the process of reducing the sampling rate. In practice, this usually implies lowpass-filtering a signal, then throwing away some of its samples.
"Downsampling" is a more specific term which refers to just the process of throwing away samples, without the lowpass filtering operation.