1 noun POL, MIL process of joining covertlyinsíothlú masc c m upolice infiltration into the groupinsíothlú na bpóilíní isteach sa ghrúpa2 noun SOCIOL gradual entryleathadh masc c m uscaipeadh masc c m uthey feared the infiltration of communismbhí eagla orthu go leathfadh an cumannachas3 noun CHEM, MED of liquid, substance etcinsíothlú masc c m uinsíothlúchán masc1fluid infiltration into the bandsinsíothlú leachta isteach sna bandaíinfiltration rateráta insíothlaithe